Front

Angle < 90°

Back

Acute Angle

Front

Angle of 90 degrees.

Back

Right Angle

Front

Angle > 90°

Back

Obtuse Angle

Front

Angle of 180°

Back

Straight Angle

Front

Tool to measure angles.

Back

Protractor

Front

Two lines equidistant and never intersecting

Back

Parallel Lines

Front

Geometric shape with 4 sides, 4 corners

Back

Quadrilateral

Front

A quadrilateral with opposite sides parallel, not necessarily right angles.

Back

Parallelogram

Front

A quadrilateral with 4 equal sides and 4 right angles.

Back

Square

Front

Quadrilateral with equal opposite sides and 4 right angles.

Back

Rectangle