Question

Find the circumference of circle with the radius 21 cm

Answer 1

Answer:

circumference = 131.95 cm

Answer 2

Answer:

Hence, the circumference of circle having radius 21 cm will be 132 cm

Step-by-step explanation:

In context to question asked,

We have to determine the circumference of the circle.

From the data given in the question,

We have,

Radius of circle = 21 cm

As we know that,

Circumference of circle is the sum of length of outer border of the circle.

As we know that,

We have,

formula for finding circumference of circle is $2\times \Pi r$

So, for determining the value of circumference of circle, we will put the value of radius of circle in above formula.

Thus we will get,

Circumference of circle  $2 \times \Pi r = 2 \times \frac{22}{7} \times 21 = 2 \times 22 \times 3 = 132\:cm$