Question

The area of the circle above is 153.86 units2. What is the circumference of the circle?

Answer 1

Explanation:

`area \: ofa \: circle = \pi {r}^(2)`

`\pi {r}^(2) = (22)/(7) * {r}^(2) \\ 153.86 = (22)/(7 ) * {r}^(2) \: \: \: \: \: \: \\ {r}^(2) = (153.86 * 7)/(22) \\ {r}^(2) = (1,077.02)/(22)\\ r = √(48.95) \\ = 6.99`

So let's take r as 7

`circumference \: of \: a \: circle = 2\pi r`

`2\pi r = 2 * (22)/(7)`

= 2× 22/7 × 7

= 44