Quadrilaterals

QUADRILATERAL

A closed geometric figure with four sides and four vertices is called a quadrilateral. The sum of all the four angles of a quadrilateral is 360⁰.

Properties of Trapezium:

1.    Sides – One pair of opposite sides is parallel.

2.    Angles – The angles at the ends of each non-parallel side are supplementary.

3.    Diagonals – Diagonals need not be equal.

Properties of Isosceles Trapezium:

1.    Sides – One pair of opposite sides is parallel, the other pair of sides is equal in length.

2.    Angles – The angles at the ends of each parallel side are equal.

3.    Diagonals – Diagonals are equal in length.

Properties of Parallelogram:

1.    Sides – Opposite sides are parallel and equal.

2.    Angles – Opposite angles are equal and sum of any two adjacent angles is 180⁰.

3.    Diagonals – Diagonals bisect each other.

Properties of Rhombus:

1.    Sides – All sides are equal and opposite sides are parallel.

2.    Angles – Opposite angles are equal and sum of any two adjacent angles is 180⁰.

3.    Diagonals – Diagonals bisect each other at right angles.