circular sector | circular segment | disk | 30-60-90 triangle | 3, 4, 5 triangle | diamond | filled ellipse | equilateral triangle | inverted equilateral triangle | golden rectangle | golden rhombus | golden triangle | half ellipse | half rectangle | half square | isosceles pentagon | isosceles right pentagon | isosceles right triangle | isosceles trapezoid | isosceles triangle | ... (total: 53)

x^2 + y^2<=a^2 and -tan(θ/2)<=x/y<=tan(θ/2) and y>=0

x^2 + y^2<=a^2 and y>=a cos(θ/2)

x^2 + y^2<=a^2

y>=0 and sqrt(3) a>=2 (sqrt(3) x + y) and x>=0

y>=0 and 12 a>=3 x + 4 y and x>=0

abs(x)/a + abs(y)/b<=1

x^2/a^2 + y^2/b^2<=1

sqrt(3) (a + 3 x)>=3 y and sqrt(3) a + 6 y>=0 and sqrt(3) a>=3 (sqrt(3) x + y)

sqrt(3) (a + 3 x)>=-3 y and sqrt(3) a>=6 y and sqrt(3) a + 3 y>=3 sqrt(3) x

-a/2<=x<=a/2 and -(a ϕ)/2<=y<=(a ϕ)/2

circular wedge | sector | slice

sublime triangle

isosceles trapezium

horizontal isosceles triangle

equiangular rectangle

regular septagon

diamond | equilateral parallelogram | rhomb

right trapezium

scalene trigon

trapezium

circular segment | (-sin(θ/2) a, cos(θ/2) a) | (sin(θ/2) a, cos(θ/2) a) 30-60-90 triangle | (0, 0) | (a/2, 0) | (0, (sqrt(3) a)/2) 3, 4, 5 triangle | (0, 3 a) | (0, 0) | (4 a, 0) diamond | (-a, 0) | (0, -b) | (a, 0) | (0, b) equilateral triangle | (0, a/sqrt(3)) | (-a/2, -a/(2 sqrt(3))) | (a/2, -a/(2 sqrt(3))) inverted equilateral triangle | (0, -a/sqrt(3)) | (a/2, a/(2 sqrt(3))) | (-a/2, a/(2 sqrt(3))) golden rectangle | (a/2, -(ϕ a)/2) | (a/2, (ϕ a)/2) | (-a/2, (ϕ a)/2) | (-a/2, -(ϕ a)/2) golden rhombus | (-a/(2 sqrt(5/8 - sqrt(5)/8)), 0) | (0, -a/(2 sqrt(5/8 + sqrt(5)/8))) | (a/(2 sqrt(5/8 - sqrt(5)/8)), 0) | (0, a/(2 sqrt(5/8 + sqrt(5)/8))) golden triangle | (-a/2, 0) | (a/2, 0) | (0, 1/2 sqrt(5 + 2 sqrt(5)) a) half rectangle | (-a/2, 0) | (a/2, 0) | (a/2, b/2) | (-a/2, b/2) half square | (-a/2, 0) | (a/2, 0) | (a/2, a/2) | (-a/2, a/2) isosceles pentagon | (-a/2, 0) | (a/2, 0) | (w, d) | (0, h) | (-w, d) isosceles right pentagon | (-a/2, 0) | (a/2, 0) | (a/2, b) | (0, h) | (-a/2, b) isosceles right triangle | (0, a) | (0, 0) | (a, 0) isosceles trapezoid | (-b/2, 0) | (b/2, 0) | (a/2, h) | (-a/2, h) isosceles triangle | (-a/2, 0) | (a/2, 0) | (0, h) Kepler triangle | (0, 0) | (sqrt(ϕ) a, 0) | (0, a) kite | (-sqrt(a^2 - h^2), 0) | (0, -h) | (sqrt(b^2 - h^2), 0) | (0, h) lozenge | (0, 0) | (a, 0) | ((1 + 1/sqrt(2)) a, a/sqrt(2)) | (a/sqrt(2), a/sqrt(2)) monokite | (0, 0) | ((sqrt(3) a)/2, (3 a)/2) | (0, 2 a) | (-(sqrt(3) a)/2, (3 a)/2) parallelogram | (0, 0) | (b, 0) | (cos(A) a + b, sin(A) a) | (cos(A) a, sin(A) a) pennant | (0, a/2) | (0, -a/2) | (h, 0) quarter rectangle | (0, 0) | (a/2, 0) | (a/2, b/2) | (0, b/2) quarter square | (0, 0) | (a/2, 0) | (a/2, a/2) | (0, a/2) rectangle | (-a/2, -b/2) | (a/2, -b/2) | (a/2, b/2) | (-a/2, b/2) regular decagon | (1/2 (1 + sqrt(5)) a, 0) | (1/4 (3 + sqrt(5)) a, sqrt(5/8 + sqrt(5)/8) a) | (a/2, 1/2 sqrt(5 + 2 sqrt(5)) a) | (-a/2, 1/2 sqrt(5 + 2 sqrt(5)) a) | (1/4 (-3 - sqrt(5)) a, sqrt(5/8 + sqrt(5)/8) a) | (1/2 (-1 - sqrt(5)) a, 0) | (1/4 (-3 - sqrt(5)) a, -1/2 sqrt(1/2 (5 + sqrt(5))) a) | (-a/2, -1/2 sqrt(5 + 2 sqrt(5)) a) | (a/2, -1/2 sqrt(5 + 2 sqrt(5)) a) | (1/4 (3 + sqrt(5)) a, -1/2 sqrt(1/2 (5 + sqrt(5))) a) regular diamond | (-a, 0) | (0, -a) | (a, 0) | (0, a) regular heptagon | (1/2 cos(π/14) csc(π/7) a, -1/2 csc(π/7) sin(π/14) a) | (1/2 cos((3 π)/14) csc(π/7) a, 1/2 csc(π/7) sin((3 π)/14) a) | (0, 1/2 csc(π/7) a) | (-1/2 cos((3 π)/14) csc(π/7) a, 1/2 csc(π/7) sin((3 π)/14) a) | (-1/2 cos(π/14) csc(π/7) a, -1/2 csc(π/7) sin(π/14) a) | (-a/2, -1/2 cot(π/7) a) | (a/2, -1/2 cot(π/7) a) regular hexagon | (a, 0) | (a/2, (sqrt(3) a)/2) | (-a/2, (sqrt(3) a)/2) | (-a, 0) | (-a/2, -(sqrt(3) a)/2) | (a/2, -(sqrt(3) a)/2) regular nonagon | (-1/2 cos(π/18) csc(π/9) a, 1/2 csc(π/9) sin(π/18) a) | (-1/4 sqrt(3) csc(π/9) a, -1/4 csc(π/9) a) | (-a/2, -1/2 cot(π/9) a) | (a/2, -1/2 cot(π/9) a) | (1/4 sqrt(3) csc(π/9) a, -1/4 csc(π/9) a) | (1/2 cos(π/18) csc(π/9) a, 1/2 csc(π/9) sin(π/18) a) | (1/2 csc(π/9) sin((2 π)/9) a, 1/2 cos((2 π)/9) csc(π/9) a) | (0, 1/2 csc(π/9) a) | (-1/2 csc(π/9) sin((2 π)/9) a, 1/2 cos((2 π)/9) csc(π/9) a) regular octagon | (1/2 cot(π/8) a, a/2) | (a/2, 1/2 cot(π/8) a) | (-a/2, 1/2 cot(π/8) a) | (-1/2 cot(π/8) a, a/2) | (-1/2 cot(π/8) a, -a/2) | (-a/2, -1/2 cot(π/8) a) | (a/2, -1/2 cot(π/8) a) | (1/2 cot(π/8) a, -a/2) regular pentagon | (1/4 (1 + sqrt(5)) a, root of 1 - 20 x^2 + 80 x^4 near x = 0.262866 a) | (0, sqrt(1/10 (5 + sqrt(5))) a) | (1/4 (-1 - sqrt(5)) a, root of 1 - 20 x^2 + 80 x^4 near x = 0.262866 a) | (-a/2, -1/2 sqrt(1 + 2/sqrt(5)) a) | (a/2, -1/2 sqrt(1 + 2/sqrt(5)) a) rhombus | (-cos(θ) a, 0) | (0, -sin(θ) a) | (cos(θ) a, 0) | (0, sin(θ) a) right trapezoid | (0, 0) | (a, 0) | (a, h_2) | (0, h_1) right triangle | (0, 0) | (a, 0) | (0, b) scalene triangle | (c, 0) | ((-a^2 + b^2 + c^2)/(2 c), sqrt((a + b - c) (a - b + c) (-a + b + c) (a + b + c))/(2 c)) | (0, 0) square | (-a/2, -a/2) | (a/2, -a/2) | (a/2, a/2) | (-a/2, a/2) trapezoid | (0, 0) | (b, 0) | ((a^2 - b^2 - c^2 + d^2)/(2 (a - b)), sqrt((a - b + c - d) (a - b - c + d) (a - b + c + d) (-a + b + c + d))/(2 (-a + b))) | (-(a^2 - 2 a b + b^2 + c^2 - d^2)/(2 (a - b)), sqrt((a - b + c - d) (a - b - c + d) (a - b + c + d) (-a + b + c + d))/(2 (-a + b))) triangle | (c, 0) | ((-a^2 + b^2 + c^2)/(2 c), sqrt((a + b - c) (a - b + c) (-a + b + c) (a + b + c))/(2 c)) | (0, 0) inverted isosceles trapezoid | (-b/2, 0) | (b/2, 0) | (a/2, sqrt(-1/4 (-a + b)^2 + c^2)) | (-a/2, sqrt(-1/4 (-a + b)^2 + c^2))

circular segment | 2 30-60-90 triangle | 3 3, 4, 5 triangle | 3 diamond | 4 equilateral triangle | 3 inverted equilateral triangle | 3 golden rectangle | 4 golden rhombus | 4 golden triangle | 3 half rectangle | 4 half square | 4 isosceles pentagon | 5 isosceles right pentagon | 5 isosceles right triangle | 3 isosceles trapezoid | 4 isosceles triangle | 3 Kepler triangle | 3 kite | 4 lozenge | 4 monokite | 4 parallelogram | 4 pennant | 3 quarter rectangle | 4 quarter square | 4 rectangle | 4 regular decagon | 10 regular diamond | 4 regular heptagon | 7 regular hexagon | 6 regular nonagon | 9 regular octagon | 8 regular pentagon | 5 rhombus | 4 right trapezoid | 4 right triangle | 3 scalene triangle | 3 square | 4 trapezoid | 4 triangle | 3 inverted isosceles trapezoid | 4

circular sector | a>0 and 0<θ<π circular segment | a>0 and 0<θ<π disk | a>0 30-60-90 triangle | a>0 3, 4, 5 triangle | a>0 diamond | a>0 and b>0 filled ellipse | a>0 and b>0 equilateral triangle | a>0 inverted equilateral triangle | a>0 golden rectangle | a>0 golden rhombus | a>0 golden triangle | a>0 half ellipse | a>0 and b>0 half rectangle | a>0 and b>0 half square | a>0 isosceles pentagon | 00 and 00 isosceles trapezoid | 00 isosceles triangle | a>0 and h>0 Kepler triangle | a>0 kite | 00 monokite | a>0 parallelogram | a>0 and b>0 and 00 and h>0 quarter ellipse | a>0 and b>0 quarter rectangle | a>0 and b>0 quarter square | a>0 rectangle | a>0 and b>0 regular decagon | a>0 regular diamond | a>0 regular heptagon | a>0 regular hexagon | a>0 regular nonagon | a>0 regular octagon | a>0 regular pentagon | a>0 rhombus | a>0 and 0<θ<π/2 right trapezoid | a>0 and h_1>0 and h_2>0 right triangle | a>0 and b>0 scalene triangle | a>0 and b>0 and c>0 and a + b>c and b + c>a and a + c>b and a!=b!=c square | a>0 trapezoid | a>0 and b>0 and c>0 and d>0 and (a - b + c - d) (a - b - c + d) (a - b + c + d) (-a + b + c + d)>0 triangle | a>0 and b>0 and c>0 and a + b>c and b + c>a and a + c>b half-disk | a>0 inverted isosceles trapezoid | 0(a - b)/2 asymmetric lens | R>0 and r>0 and abs(R - r)0 Reuleaux triangle | a>0 rounded rectangle | a>0 and b>0 and r>0 stadium | a>0 and r>0 vesica piscis | a>0

diamond | 2 a | 2 b golden rectangle | a sqrt(ϕ^2 + 1) | a sqrt(ϕ^2 + 1) golden rhombus | a/sqrt(5/8 - sqrt(5)/8) | a/sqrt(5/8 + sqrt(5)/8) isosceles pentagon | sqrt(1/4 (a + 2 w)^2 + d^2) | sqrt(a^2/4 + h^2) | sqrt(a^2/4 + h^2) | sqrt((a/2 + w)^2 + d^2) | 2 w isosceles right pentagon | sqrt(a^2 + b^2) | sqrt(a^2/4 + h^2) | sqrt(a^2/4 + h^2) | sqrt(a^2 + b^2) | a isosceles trapezoid | 1/2 sqrt((a + b)^2 + 4 h^2) | 1/2 sqrt((a + b)^2 + 4 h^2) kite | sqrt(a^2 - h^2) + sqrt(b^2 - h^2) | 2 h lozenge | sqrt(2 + sqrt(2)) a | sqrt(2 - sqrt(2)) a monokite | 2 a | sqrt(3) a parallelogram | sqrt(a^2 - 2 a b cos(A) + b^2) | sqrt(a^2 + 2 a b cos(A) + b^2) rectangle | sqrt(a^2 + b^2) | sqrt(a^2 + b^2) regular decagon | sqrt(1/2 (5 + sqrt(5))) a | sqrt(1/2 (5 + sqrt(5))) a | sqrt(1/2 (5 + sqrt(5))) a | sqrt(1/2 (5 + sqrt(5))) a | sqrt(1/2 (5 + sqrt(5))) a | sqrt(1/2 (5 + sqrt(5))) a | sqrt(1/2 (5 + sqrt(5))) a | sqrt(1/2 (5 + sqrt(5))) a | sqrt(1/2 (5 + sqrt(5))) a | sqrt(1/2 (5 + sqrt(5))) a | 1/2 (3 + sqrt(5)) a | 1/2 (3 + sqrt(5)) a | 1/2 (3 + sqrt(5)) a | 1/2 (3 + sqrt(5)) a | 1/2 (3 + sqrt(5)) a | 1/2 (3 + sqrt(5)) a | 1/2 (3 + sqrt(5)) a | 1/2 (3 + sqrt(5)) a | 1/2 (3 + sqrt(5)) a | 1/2 (3 + sqrt(5)) a | sqrt(5 + 2 sqrt(5)) a | sqrt(5 + 2 sqrt(5)) a | sqrt(5 + 2 sqrt(5)) a | sqrt(5 + 2 sqrt(5)) a | sqrt(5 + 2 sqrt(5)) a | sqrt(5 + 2 sqrt(5)) a | sqrt(5 + 2 sqrt(5)) a | sqrt(5 + 2 sqrt(5)) a | sqrt(5 + 2 sqrt(5)) a | sqrt(5 + 2 sqrt(5)) a | (1 + sqrt(5)) a | (1 + sqrt(5)) a | (1 + sqrt(5)) a | (1 + sqrt(5)) a | (1 + sqrt(5)) a regular diamond | 2 a | 2 a regular heptagon | a root of x^3 - x^2 - 2 x + 1 near x = 1.80194 | a root of x^3 - x^2 - 2 x + 1 near x = 1.80194 | a root of x^3 - x^2 - 2 x + 1 near x = 1.80194 | a root of x^3 - x^2 - 2 x + 1 near x = 1.80194 | a root of x^3 - x^2 - 2 x + 1 near x = 1.80194 | a root of x^3 - x^2 - 2 x + 1 near x = 1.80194 | a root of x^3 - x^2 - 2 x + 1 near x = 1.80194 | a root of x^3 - 2 x^2 - x + 1 near x = 2.24698 | a root of x^3 - 2 x^2 - x + 1 near x = 2.24698 | a root of x^3 - 2 x^2 - x + 1 near x = 2.24698 | a root of x^3 - 2 x^2 - x + 1 near x = 2.24698 | a root of x^3 - 2 x^2 - x + 1 near x = 2.24698 | a root of x^3 - 2 x^2 - x + 1 near x = 2.24698 | a root of x^3 - 2 x^2 - x + 1 near x = 2.24698 regular hexagon | sqrt(3) a | sqrt(3) a | sqrt(3) a | sqrt(3) a | sqrt(3) a | sqrt(3) a | 2 a | 2 a | 2 a regular nonagon | a root of x^3 - 3 x - 1 near x = 1.87939 | a root of x^3 - 3 x - 1 near x = 1.87939 | a root of x^3 - 3 x - 1 near x = 1.87939 | a root of x^3 - 3 x - 1 near x = 1.87939 | a root of x^3 - 3 x - 1 near x = 1.87939 | a root of x^3 - 3 x - 1 near x = 1.87939 | a root of x^3 - 3 x - 1 near x = 1.87939 | a root of x^3 - 3 x - 1 near x = 1.87939 | a root of x^3 - 3 x - 1 near x = 1.87939 | a root of x^3 - 3 x^2 + 3 near x = 2.53209 | a root of x^3 - 3 x^2 + 3 near x = 2.53209 | a root of x^3 - 3 x^2 + 3 near x = 2.53209 | a root of x^3 - 3 x^2 + 3 near x = 2.53209 | a root of x^3 - 3 x^2 + 3 near x = 2.53209 | a root of x^3 - 3 x^2 + 3 near x = 2.53209 | a root of x^3 - 3 x^2 + 3 near x = 2.53209 | a root of x^3 - 3 x^2 + 3 near x = 2.53209 | a root of x^3 - 3 x^2 + 3 near x = 2.53209 | a root of x^3 - 3 x^2 + 1 near x = 2.87939 | a root of x^3 - 3 x^2 + 1 near x = 2.87939 | a root of x^3 - 3 x^2 + 1 near x = 2.87939 | a root of x^3 - 3 x^2 + 1 near x = 2.87939 | a root of x^3 - 3 x^2 + 1 near x = 2.87939 | a root of x^3 - 3 x^2 + 1 near x = 2.87939 | a root of x^3 - 3 x^2 + 1 near x = 2.87939 | a root of x^3 - 3 x^2 + 1 near x = 2.87939 | a root of x^3 - 3 x^2 + 1 near x = 2.87939 regular octagon | sqrt(2 + sqrt(2)) a | sqrt(2 + sqrt(2)) a | sqrt(2 + sqrt(2)) a | sqrt(2 + sqrt(2)) a | sqrt(2 + sqrt(2)) a | sqrt(2 + sqrt(2)) a | sqrt(2 + sqrt(2)) a | sqrt(2 + sqrt(2)) a | (1 + sqrt(2)) a | (1 + sqrt(2)) a | (1 + sqrt(2)) a | (1 + sqrt(2)) a | (1 + sqrt(2)) a | (1 + sqrt(2)) a | (1 + sqrt(2)) a | (1 + sqrt(2)) a | sqrt(2 (2 + sqrt(2))) a | sqrt(2 (2 + sqrt(2))) a | sqrt(2 (2 + sqrt(2))) a | sqrt(2 (2 + sqrt(2))) a regular pentagon | a ϕ | a ϕ | a ϕ | a ϕ | a ϕ rhombus | 2 a cos(θ) | 2 a sin(θ) right trapezoid | sqrt(a^2 + h_1^2) | sqrt(a^2 + h_2^2) square | sqrt(2) a | sqrt(2) a trapezoid | sqrt((a^2 (-b) + a b^2 - a c^2 + b d^2)/(b - a)) | sqrt((a^2 (-b) + a b^2 - a d^2 + b c^2)/(b - a)) inverted isosceles trapezoid | sqrt(a b + c^2) | sqrt(a b + c^2)

circular sector | r = a cos(θ/2) circular segment | r = a cos(θ/2) equilateral triangle | r = a/(2 sqrt(3)) inverted equilateral triangle | r = a/(2 sqrt(3)) regular decagon | r = 1/2 sqrt(5 + 2 sqrt(5)) a regular heptagon | r = 1/2 a cot(π/7) regular hexagon | r = (sqrt(3) a)/2 regular nonagon | r = 1/2 a cot(π/9) regular octagon | r = 1/2 (1 + sqrt(2)) a regular pentagon | r = 1/10 sqrt(25 + 10 sqrt(5)) a square | r = a/2

circular sector | h = a (1 - cos(θ/2)) circular segment | h = a (1 - cos(θ/2)) equilateral triangle | h = a/(2 sqrt(3)) inverted equilateral triangle | h = a/(2 sqrt(3)) regular decagon | h = 1/2 (1 + sqrt(5) - sqrt(5 + 2 sqrt(5))) a regular heptagon | h = 1/2 a tan(π/14) regular hexagon | h = -1/2 (sqrt(3) - 2) a regular nonagon | h = 1/2 a tan(π/18) regular octagon | h = 1/2 (-1 - sqrt(2) + sqrt(2 (2 + sqrt(2)))) a regular pentagon | h = 1/2 sqrt(1 - 2/sqrt(5)) a square | h = 1/2 (sqrt(2) - 1) a

circular sector | a (1 - cos(θ/2)) circular segment | a cos(θ/2) 30-60-90 triangle | (sqrt(3) a)/2 3, 4, 5 triangle | 3 a equilateral triangle | (sqrt(3) a)/2 inverted equilateral triangle | (sqrt(3) a)/2 golden rectangle | a ϕ golden triangle | 1/2 sqrt(5 + 2 sqrt(5)) a half rectangle | b/2 half square | a/2 isosceles pentagon | h isosceles right pentagon | h isosceles right triangle | a isosceles trapezoid | h isosceles triangle | h Kepler triangle | a monokite | 2 a parallelogram | a sin(A) pennant | a quarter rectangle | b/2 quarter square | a/2 rectangle | b regular pentagon | 1/2 sqrt(5 + 2 sqrt(5)) a right triangle | b scalene triangle | sqrt((a + b - c) (a - b + c) (-a + b + c) (a + b + c))/(2 c) square | a trapezoid | sqrt((a - b + c - d) (a - b - c + d) (a - b + c + d) (-a + b + c + d))/(2 (b - a)) triangle | sqrt((a + b - c) (a - b + c) (-a + b + c) (a + b + c))/(2 c) inverted isosceles trapezoid | sqrt(c^2 - 1/4 (b - a)^2)

circular sector | A = (a^2 θ)/2 circular segment | A = 1/2 a^2 (θ - sin(θ)) disk | A = π a^2 30-60-90 triangle | A = (sqrt(3) a^2)/8 3, 4, 5 triangle | A = 6 a^2 diamond | A = 2 a b filled ellipse | A = π a b equilateral triangle | A = (sqrt(3) a^2)/4 inverted equilateral triangle | A = (sqrt(3) a^2)/4 golden rectangle | A = a^2 ϕ golden rhombus | A = (2 a^2)/sqrt(5) golden triangle | A = 1/4 sqrt(5 + 2 sqrt(5)) a^2 half ellipse | A = (π a b)/2 half rectangle | A = (a b)/2 half square | A = a^2/2 isosceles pentagon | A = (a d)/2 + h w isosceles right pentagon | A = 1/2 a (b + h) isosceles right triangle | A = a^2/2 isosceles trapezoid | A = 1/2 h (a + b) isosceles triangle | A = (a h)/2 Kepler triangle | A = (a^2 sqrt(ϕ))/2 kite | A = h (sqrt(a^2 - h^2) + sqrt(b^2 - h^2)) lozenge | A = a^2/sqrt(2) monokite | A = sqrt(3) a^2 parallelogram | A = a b sin(A) pennant | A = (a h)/2 quarter ellipse | A = (π a b)/4 quarter rectangle | A = (a b)/4 quarter square | A = a^2/4 rectangle | A = a b regular decagon | A = 5/2 sqrt(5 + 2 sqrt(5)) a^2 regular diamond | A = 2 a^2 regular heptagon | A = 7/4 a^2 cot(π/7) regular hexagon | A = (3 sqrt(3) a^2)/2 regular nonagon | A = 9/4 a^2 cot(π/9) regular octagon | A = 2 (1 + sqrt(2)) a^2 regular pentagon | A = 5/4 sqrt(1 + 2/sqrt(5)) a^2 rhombus | A = a^2 sin(2 θ) right trapezoid | A = 1/2 a (h_1 + h_2) right triangle | A = (a b)/2 scalene triangle | A = 1/4 sqrt((a + b - c) (a - b + c) (-a + b + c) (a + b + c)) square | A = a^2 trapezoid | A = ((a + b) sqrt((a - b + c - d) (a - b - c + d) (a - b + c + d) (-a + b + c + d)))/(4 (b - a)) triangle | A = 1/4 sqrt((a + b - c) (a - b + c) (-a + b + c) (a + b + c)) half-disk | A = (π a^2)/2 inverted isosceles trapezoid | A = 1/4 (a + b) sqrt(4 c^2 - (b - a)^2) asymmetric lens | A = r^2 cos^(-1)((d^2 + r^2 - R^2)/(2 d r)) + R^2 cos^(-1)((d^2 - r^2 + R^2)/(2 d R)) - 1/2 sqrt((d + r - R) (d - r + R) (-d + r + R) (d + r + R)) symmetric lens | A = -1/2 d sqrt(4 a^2 - d^2) - 2 a^2 tan^(-1)(d/sqrt(4 a^2 - d^2)) + π a^2 quarter disk | A = (π a^2)/4 Reuleaux triangle | A = 1/2 (π - sqrt(3)) a^2 rounded rectangle | A = 2 r (a + b) + a b + π r^2 stadium | A = 2 a r + π r^2 vesica piscis | A = 1/6 (4 π - 3 sqrt(3)) a^2

circular sector | x^_ = (0, 2/3 sinc(θ/2) a) circular segment | x^_ = (0, (4 sin^3(θ/2) a)/(3 (-sin(θ) + θ))) disk | x^_ = (0, 0) 30-60-90 triangle | x^_ = (a/6, a/(2 sqrt(3))) 3, 4, 5 triangle | x^_ = ((4 a)/3, a) diamond | x^_ = (0, 0) filled ellipse | x^_ = (0, 0) equilateral triangle | x^_ = (0, 0) inverted equilateral triangle | x^_ = (0, 0) golden rectangle | x^_ = (0, 0) golden rhombus | x^_ = (0, 0) golden triangle | x^_ = (0, 1/6 sqrt(5 + 2 sqrt(5)) a) half ellipse | x^_ = (0, (4 b)/(3 π)) half rectangle | x^_ = (0, b/4) half square | x^_ = (0, a/4) isosceles pentagon | x^_ = (0, (a d^2 + 2 h (d + h) w)/(3 a d + 6 h w)) isosceles right pentagon | x^_ = (0, 1/3 (h + b^2/(b + h))) isosceles right triangle | x^_ = (a/3, a/3) isosceles trapezoid | x^_ = (0, ((2 a + b) h)/(3 (a + b))) isosceles triangle | x^_ = (0, h/3) Kepler triangle | x^_ = ((sqrt(ϕ) a)/3, a/3) kite | x^_ = (1/3 (-sqrt(a^2 - h^2) + sqrt(b^2 - h^2)), 0) lozenge | x^_ = (1/4 (2 + sqrt(2)) a, a/(2 sqrt(2))) monokite | x^_ = (0, (7 a)/6) parallelogram | x^_ = (1/2 (cos(A) a + b), 1/2 sin(A) a) pennant | x^_ = (h/3, 0) quarter ellipse | x^_ = ((4 a)/(3 π), (4 b)/(3 π)) quarter rectangle | x^_ = (a/4, b/4) quarter square | x^_ = (a/4, a/4) rectangle | x^_ = (0, 0) regular decagon | x^_ = (0, 0) regular diamond | x^_ = (0, 0) regular heptagon | x^_ = (0, 0) regular hexagon | x^_ = (0, 0) regular nonagon | x^_ = (0, 0) regular octagon | x^_ = (0, 0) regular pentagon | x^_ = (0, 0) rhombus | x^_ = (0, 0) right trapezoid | x^_ = ((a (h_1 + 2 h_2))/(3 (h_1 + h_2)), 1/3 (h_2 + h_1^2/(h_1 + h_2))) right triangle | x^_ = (a/3, b/3) scalene triangle | x^_ = ((-a^2 + b^2 + 3 c^2)/(6 c), sqrt((a + b - c) (a - b + c) (-a + b + c) (a + b + c))/(6 c)) square | x^_ = (0, 0) trapezoid | x^_ = (b/2 + ((2 a + b) (c^2 - d^2))/(6 (-a^2 + b^2)), ((2 a + b) sqrt((a - b + c - d) (a - b - c + d) (a - b + c + d) (-a + b + c + d)))/(6 (-a^2 + b^2))) triangle | x^_ = ((-a^2 + b^2 + 3 c^2)/(6 c), sqrt((a + b - c) (a - b + c) (-a + b + c) (a + b + c))/(6 c)) half-disk | x^_ = (0, (4 a)/(3 π)) inverted isosceles trapezoid | x^_ = (0, ((2 a + b) sqrt(-(-a + b)^2 + 4 c^2))/(6 (a + b))) symmetric lens | x^_ = (0, 0) quarter disk | x^_ = ((4 a)/(3 π), (4 a)/(3 π)) Reuleaux triangle | x^_ = (0, 0) rounded rectangle | x^_ = (0, 0) stadium | x^_ = (0, 0) vesica piscis | x^_ = (0, 0)