Question

Need help on this please

Answer 1

25
`\pi`

Explanation:

`\pi`
`r^(2)`=area of circle

`(1)/(4)`
`\pi`
`r^(2)`=1/4 of the area of a circle

now solve

`(1)/(4)`
`\pi`
`10^(2)`

`(1)/(4)`
`\pi`100

25
`\pi`