Geometry Basics

Front

Parallel Lines

Back

Lines that are always the same distance apart and never meet, no matter how far they are extended.

Front

Perpendicular Lines

Back

Lines that intersect at a right angle (90 degrees).

Front

Intersecting Lines

Back

Lines that cross each other at any angle other than 90 degrees.

Front

Angle

Back

Formed when two rays meet at a common endpoint called the vertex.

Front

Acute Angle

Back

An angle that measures less than 90°.

Front

Right Angle

Back

An angle that measures exactly 90°.

Front

Obtuse Angle

Back

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

Front

Straight Angle

Back

An angle that measures exactly 180°.

Front

Reflex Angle

Back

An angle that measures more than 180° but less than 360°.

Front

Full Rotation Angle

Back

An angle that measures exactly 360°.