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    Obtuse Angle

    Illustration

    Illustration

    Basic definition

    An obtuse angle is an angle that measures greater than 90 degrees and less than 180 degrees.

    Detailed definition

    An angle greater than π/2 radians (90°) and less than π radians (180°).

    Related terms

    acute angle | full angle | obtuse triangle | reflex angle | right angle | straight angle

    Educational grade level

    elementary school level (California grade 4 standard)

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