**Quadrilaterals** are shapes which have 4 straight sides. The sum of the interior angles of any quadrilateral add up to 360

## Contents

## Special Types of Quadrilaterals[edit | edit source]

### Rectangle[edit | edit source]

A rectangle is a quadrilateral which has 2 sets of parallel sides. All the angles in a rectangle are equal to 90.

### Square[edit | edit source]

A square is a regular type of quadrilateral, and a special type of rectangle which has 4 equal sides. All the angles in a square are equal to 90

The area of a square can be worked out by squaring one of its lengths.

### Parallelogram[edit | edit source]

a parallelogram is a quadrilateral with two sets of parallel sides. The opposite sides of a parallelogram are of equal length, and the opposite angles of a parallelogram are congruent.

### Trapezium[edit | edit source]

A Trapezium is a quadrilateral which has 2 parallel sides of different lengths. Area of Trapezium =

### Rhombus[edit | edit source]

A rhombus is a quadrilateral that has 4 sides of equal length, and whose opposite angles are equal. The area can be worked out by multiplying the two diagonals together and the dividing by 2.