Question

A circular swimming pool has a radius of 20 feet of fence is going to be built So that there is a 4 foot space around the entire pool what is the length of the fence Cynthia solve the problem as shown what was her error

Answer 1

The length of the fence is 45.09ft

Explanation:

To solve this exercise we first have to calculate the radius of the pool and then add the 4 foot we want to distance it.

r = radius

π = 3.14

c = circumference = 20ft

c = π * 2r

we clear r

r = c / 2π

now we replace the values ​​we know

r = 20ft / 2 * 3.14

r = 3.18ft

now we add the 4 feet we want away

3.18ft + 4ft = 7.18ft

r = 7.18ft

c2 = π * 2r

c2 = 3.14 * 2 * 7.18

c2 = 45.09ft

The length of the fence is 45.09ft