Question

A circular lawn of radius 10 mhas a circular flower bed of radius 5m dug into it.

What is the area of the remaining lawn? Give your answer in terms of pi (3.14)

Answer 1

A=3.14x10•10=314

10x10=100
3.14x100=314

Answer 2

75π
`m^(2)` ≈ 235.62
`m^(2)`

Explanation:

R represents the radius of the lawn

r represents the area of the circular bed

So,

Area of the remaining lawn, A = area of the lawn - area of the circular flower bed

A = πR^2 - π^2

A = π(R^2 - r^2)

A = π(10^2 - 5^2)

A = π( 100 - 25)

A = 75π
`m^(2)` ≈ 235.62
`m^(2)`