Question

Can someone help me with this problem?

Answer 1

88

Explanation:

First find the area of the fountain using the area formula of a circle.

The formula for area is
`A = \pi r^2`. Here the radius is 5 ft. So the area is
`A =\pi r^2 = \pi 5^ 2= 25\pi = 78.5`.

We will subtract the area of 78.5 from the larger circle of the brick path and fountain to find only the area of the brick path.

The larger circle has an area of
`A =\pi r^2 = \pi 9^ 2= 81\pi = 254.34` where the radius is 9ft.

Subtract to find the area of the path: 254.34 - 78.5 = 175.84. Divide this area by 2 to find the number of bricks needed since each brick is 2 square feet.

175.84/2 = 87.92 = 88 bricks