Question

Work out the area of a circle whose diameter is equal to 14 cm.

Give your answer correct to 2 decimal places.
cm?

help

Answer 1

Given:

The diameter of the circle = 14 cm

To find:

The area of the circle.

Solution:

We have,

Diameter of the circle = 14 cm

We know that the radius of the circle is half of its diameter. So,

`r=(14)/(2)`

`r=7\text{ cm}`

The area of a circle is:

`A=\pi r^2`

Substituting
`\pi=(22)/(7), r=7` in the above formula, we get

`A=(22)/(7)* (7)^2`

`A=22* 7`

`A=154`

Therefore, the area of the circle is 154 square cm.