Question

The area of circle is 770cm^2then find its circumfrence​

Answer 1

The circumference is 98.39 centimeters (rounded to 2 decimal places)

Explanation:

The area of a circle has the formula
`\pi r^2`

The circumference of a circle has the formula
`2\pi r`

First, let's find r from area given:

`\pi r^ 2= 770\\r^2 = (770)/(\pi)\\r=\sqrt{(770)/(\pi)} \\r=15.66`

Now, we can use this value of r and plug in into the formula for circumference. Shown below:

`2\pi (15.66)\\=98.39`

The circumference is 98.39 centimeters (rounded to 2 decimal places)