Middle School Geometry Review

Front

Ray

Back

A part of a line that has a fixed starting point and extends infinitely in one direction.

Front

Perpendicular

Back

Two lines that intersect at a right angle (90 degrees).

Front

Congruent

Back

Identical in form; having the same size and shape.

Front

Complementary Angles

Back

Two angles that add up to 90 degrees.

Front

Bisect

Back

To divide into two equal parts.

Front

Parallel Lines

Back

Lines in a plane that never meet and are always the same distance apart.

Front

Transversal

Back

A line that intersects two or more lines at different points.

Front

Acute Angle

Back

An angle that measures less than 90 degrees.

Front

Obtuse Angle

Back

An angle that measures more than 90 degrees but less than 180 degrees.

Front

Straight Angle

Back

An angle that measures exactly 180 degrees.