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Perpendicular Lines

Illustration

Illustration

Alternate name
Basic definition

Two lines, vectors, planes, etc. that intersect at a right angle are said to be perpendicular.

Detailed definition

Two lines, vectors, planes, etc., are said to be perpendicular if they meet at a right angle. In R^n, two vectors a and b are perpendicular if their dot product
a·b = 0.
In R^2, a line with slope m_2 = - 1/m_1 is perpendicular to a line with slope m_1. Perpendicular objects are sometimes said to be

Educational grade level

elementary school level (California grade 4 standard)

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