First 9 Week Geometry Terms Flashcards

Front

Angle

Back

Figure formed when two rays share a common endpoint.

Front

Vertex

Back

Common endpoint of an angle.

Front

Degree

Back

The measure of an angle; one degree is equivalent to 1/360 of a circle.

Front

Acute Angle

Back

An angle that measures between 0 to 90°.

Front

Right Angle

Back

An angle that measures exactly 90°.

Front

Obtuse Angle

Back

An angle that measures between 90 to 180°.

Front

Straight Angle

Back

An angle that measures exactly 180°.

Front

Congruent Angles

Back

Angles that have the same measure.

Front

Angle Bisector

Back

A ray that divides an angle into two congruent angles, each with a measure equal to exactly half of the original angle.

Front

Linear Pair

Back

A pair of adjacent angles whose non-common sides are opposite rays.