Quadrilaterals

Types of Quadrilaterals There are six basic types of quadrilaterals: 1.  Rectangle Opposite sides of a rectangle are parallel and equal.  All angles are 90º. 2.  Square Opposite sides of a square are parallel and all sides are equal.  All angles are 90º. 3.  Parallelogram Opposite sides of a parallelogram are parallel and equal.  Opposite angles are equal. 4.  Rhombus All sides of a rhombus are equal and opposite sides are parallel.  Opposite angles of a rhombus are equal.  The diagonals of a rhombus bisect each other at right angles.   5.  Trapezium A trapezium has one pair of opposite sides parallel.  A regular trapezium has non-parallel sides equal and its base angles are equal, as shown in the following diagram. 6.  Kite Two pairs of adjacent sides of a kite are equal, and one pair of opposite angles are equal.   Diagonals intersect at right angles.  One diagonal is bisected by the other.

4.  Rhombus All sides of a rhombus are equal and opposite sides are parallel.  Opposite angles of a rhombus are equal.  The diagonals of a rhombus bisect each other at right angles.   5.  Trapezium A trapezium has one pair of opposite sides parallel.  A regular trapezium has non-parallel sides equal and its base angles are equal, as shown in the following diagram. 6.  Kite Two pairs of adjacent sides of a kite are equal, and one pair of opposite angles are equal.   Diagonals intersect at right angles.  One diagonal is bisected by the other.