Question

The city park is building a fish pond with a surrounding walkway. The pond has a 15-foot radius. There will be a 5-foot wide walkway around the pond using 4" x 8" bricks.
graphic of circular pond with radius 15 feet surrounded by larger circle
Find the circumference of the pond (this is also the distance around the inner portion of the walkway). Use pi = 3.14 for all your calculations.
Find the area of the pond.
Find the circumference of the outer walkway

Find the area of the larger circle with a 20-foot radius.

Find the area of the walkway (area of larger circle - area of pond).

Answer 1

\[2\pi r\] for the circumference of the pond
in your case \(r=15\)

Answer 2

94.25