# Interior and exterior angles

A polygon is simply a shape with three or more sides and angles. Quadrilaterals are 2D shapes with four sides and angles.

There are six special quadrilaterals with different properties.

### Square

• A square has four sides of equal length.
• It has four right angles (90°).
• The opposite sides are parallel.
• The each other at right angles.
• The exterior angles of a square are each 90°.

### Rectangle

• A rectangle has two pairs of equal sides.
• It has four right angles (90°).
• The opposite sides are parallel.
• The diagonals bisect each other.
• The exterior angles of a rectangle are each 90°.

### Parallelogram

• A parallelogram has two pairs of equal sides.
• It has two pairs of equal angles.
• It has two pairs of equal exterior angles.
• The opposite sides are parallel.
• The diagonals bisect each other.

### Rhombus

• A rhombus has four sides of equal lengths.
• It has two pairs of equal angles.
• It has two pairs of equal exterior angles.
• The opposite sides are parallel.
• The diagonals bisect each other at right angles.

### Trapezium

• A trapezium has one pair of parallel sides.

### Kite

• A kite has two pairs of equal sides.
• It has one pair of equal angles.
• One diagonal is bisected at right angles by the other.