Question

find the circumference and area of a circle of radius 15 CM

Answer 1

The formula for area of a circle
=π(r) square
Where r denotes the radius.

So area of the circle of r=15 
=3.14×(15)2
=706.5cm2

circumference = 2 πr
= 2 ( 3.14)(15)
= 30× 3.14
= 94.2

Answer 2

Concept:

The area is the space occupied by any shape, it is found out by multiplying its width and length.

Given:

We have,

Radius of a circle = 15 cm

Find:

We are asked to find the circumference and area of a circle.

Solution:

So,

We have,

Radius of a circle = 15 cm

So,

Using the formula of area of the circle,

i.e..

Area of circle = πr²

So,

Area of circle = (22/7) × 15² = 4950/7 = 707.14 cm²

Now,

Using the formula for the circumference of the circle,

i.e.

Circumference of circle = 2πr

So,

Circumference of circle = 2 × (22/7) × 15 = 660/7 = 94.28 cm

Hence, the circumference of a circle is 94.28 cm, and the area of a circle is 707.14 cm².

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