An angle of a parallelogram measures 70°. Find the measure of the remaining three angles.

In the following figure, ABCD is a parallelogram. Find measures of x, y and z.

In the following figure, find the measures of x, y, z and w.

One angle of a quadrilateral is 111° and the remaining three angles are equal Find three angles.

What is the ratio of the interior angles of a pentagon and a decagon.

Note: (i) A pentagon has 5 sides, (ii) A decagon has 10 sides.

How many sides are there is a heptagon?

• 5

• 6

• 7

What do we call a polygon having six sides?

• octagon

• septagon

• hexagon

What do we call a regular polygon having three sides?

• equilateral triangle

• isosceles triangle

• scalene triangle

139.

What do we call a regular polygon having four sides?

• Rectangle

• square

• rhombus

The number of diagonals in a polygon of n-sides is given by: