Quadrilaterals & Triangles Vocab

Front

Quadrilateral

Back

A four-sided polygon.

Front

Parallelogram

Back

A quadrilateral with opposite sides that are parallel and equal in length.

Front

Rectangle

Back

A parallelogram with four right angles.

Front

Square

Back

A rectangle with all sides equal in length.

Front

Rhombus

Back

A parallelogram with all four sides equal in length but without right angles.

Front

Trapezoid

Back

A quadrilateral with only one pair of parallel sides.

Front

Equilateral Triangle

Back

A triangle with all three sides equal in length.

Front

Isosceles Triangle

Back

A triangle with two sides of equal length.

Front

Scalene Triangle

Back

A triangle with all sides of different lengths.

Front

Acute Triangle

Back

A triangle where all three angles are less than 90°.