Two regular polygons are such that the ratio of the measures their interior angles is 4 : 3 and the ratio between their number of sides is 2 : 1. Find the number of sides of each polygon.

In the following figure, both RISK and CLUE are parallelogram. Find the value of x.

Explain how this figure is a trapezium. Which of its two sides are parallel?

Find in the adjoining if

In a parallelogram ABCD, if , then find the .

PQRS is a parallelogram such that , then find ,

Two opposite angles of a parallelogram are (5x - 8)° and (2x + 82)°. Find the measures of each angle of the parallelogram.

Find the perimeter of the parallelogram BCDE.

In the figure, PQRS is a parallelogram. Find x, y and z.

In a parallelogram if measures of two adjacent angles are in the ratio of 4 : 5, find all the angles.