Geometry Vocabulary

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Last updated 6:33 PM on 2/5/26
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12 Terms

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Right Angle

An angle that measures 90 degrees

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Supplementary Angles

Two angles whose sum is 180 degrees

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Complementary Angles

Two angles whose sum is 90 degrees

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Adjacent Angles

Two angles that share a common side and have the same vertex

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Vertex

A point where two or more straight lines meet.

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Angles on a Line

The measurements of all angles on a line with a common vertex; the sum is 180 degrees

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Congruent

Having the same measurement

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Vertical Angles

Two angles formed by two intersecting lines. They are always congruent.

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Straight Angle

An angle that measures exactly 180 degrees, forming a straight line.

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Triangle

A three-sided polygon with three angles.

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Circle

A round shape with all points equidistant from the center.

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