Classifying Quadrilaterals and Triangles

A quadrilateral is a shape with four sides and four angles.

The main types of quadrilaterals are squares, rectangles, rhombuses, trapezoids, and parallelograms.

A square is a quadrilateral with four equal sides and four right angles.

A rectangle is a quadrilateral with opposite sides equal and four right angles.

A rhombus is a quadrilateral with all four sides equal and opposite angles equal.

A trapezoid is a quadrilateral with at least one pair of parallel sides.

The sum of the angles in a quadrilateral is 360 degrees.

A square can be identified by having four equal sides and four right angles.

A rectangle can be identified by having opposite sides equal and four right angles.

A rhombus can be identified by having all four sides equal and opposite angles equal.