Example:
The diameter of a circle is 21 cm. Find its circumference.

Solution:
Given that,
Diameter (d) = 21 cm. The circumference of the circle = pd.
We know the value of p = 22/7
Circumference = 22/7 * 21
= 22 * 3
= 66 cm.

Directions: Read the above example carefully and answer the following questions.

Draw 10 different circles. Find the circumference of each circle by using the formula and by using a thread.