Chapter 16 – Parallelograms – R S Aggarwal Solutions for class 8

Some important definitions

1) Parallelogram: It is a quadrilateral in which both pairs of its opposite sides are parallel.

ABCD is a parallelogram with AB//CD and AD//BC

2) Rhombus: It is a parallelogram in which all sides are equal.

ABCD is a rhombus with AB//CD and AD//BC

Also, AB = BC = CD = DA

3) Rectangle: It is a parallelogram in which each angle is a right angle.

ABCD is a rectangle with AB//CD and AD//BC

And, AB = CD, AD = BC and each angle = 90?

4) Square: It is a parallelogram in which each angle is a right angle and all sides are equal.

ABCD is a square with AB//CD and AD//BC

And, AB = CD = AD = BC and each angle = 90?

5) Trapezium: It is a quadrilateral which is having exactly one pair of parallel sides.

ABCD is a trapezium in which AB//CD

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