Geometry Flashcards

Front

Angle

Back

An angle is formed by two rays with a common endpoint (vertex).

Front

Acute angle

Back

An angle that is less than 90 degrees.

Front

Right angle

Back

An angle that is exactly 90 degrees.

Front

Obtuse angle

Back

An angle that is greater than 90 degrees but less than 180 degrees.

Front

Straight angle

Back

An angle that is exactly 180 degrees (straight line).

Front

Congruent angles

Back

Angles that are exactly the same degrees (equal).

Front

Adjacent angles

Back

Two angles that share a common vertex and side (they are next to each other).

Front

Vertical angles

Back

Two angles that are across from each other when two lines intersect (and they are congruent).

Front

Complementary angles

Back

Two angles whose sum is 90 degrees (they don’t have to be adjacent).

Front

Supplementary angles

Back

Two angles whose sum is 180 degrees (they don’t have to be adjacent).