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Kinds of Quadrilaterals

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Kinds of Quadrilaterals - Lesson Summary

A quadrilateral is a four sided polygon. We can differentiate quadrilaterals based upon the sides and the angles between sides.

Adjacent sides
The sides which have a common vertex are called adjacent sides.

Opposite sides
Two sides of a quadrilateral are called its opposite sides, if they do not have a common end point.

Adjacent angles
Angles having one arm in common are called adjacent angles.

Opposite angles
Angles at the opposite vertices are called opposite angles.

Diagonals
The lines joining the opposite vertices of the parallelogram are called diagonals.

Trapezium
A quadrilateral with a pair of opposite sides parallel is called a trapezium.

Isosceles trapezium
If the non parallel sides of the trapezium have the same length, then the trapezium is called an isosceles trapezium.

Kite
A quadrilateral having exactly two distinct consecutive pairs of sides of equal length is called kite.

Parallelogram
A quadrilateral with opposite sides parallel and equal to each other is called a parallelogram. The diagonals of a parallelogram are not equal.

Rhombus
A parallelogram having all sides equal is called a rhombus.

Property: The opposite sides of a parallelogram are equal.



Property: The opposite angles of a parallelogram are of equal measure.



Property: The diagonals of a parallelogram bisect each other.

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