Quadrilaterals

Parallelogram

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

Rectangle

a box shape on a plane with four right angles and opposite sides equal in length.

Square

A special type of rectangle that has four equal sides and four right angles.

Rhombus

a paralleogram with all four sides equal in length.

Trapezoid

A quadrilateral with at least one pair of parallel sides.

congruent

having the same size and shape, allowing for rotation and reflection.

similar

having the same shape but not necessarily the same size; can be obtained by scaling.