Question

If S=4πr² , find
i) the value of S when r = 10

Answer 1

400pi, or 1256.637...

Explanation:

S = 4pir^2

S = 4pi(10^2)

S = 4pi(100)

S = 400pi

Answer 2

S = 1256

Explanation:

S = 4
`\pi`
`r^2`

S = 4
`\pi`
`(10)^2`

S = 4
`\pi`
`(100)`

S =
`4(314)`

S = 1256