Question

How many square feet are in a circle 80 feet in diameter (across)?

Answer 1

We are asked to determine the area of a circle with a diameter of 80 feet. To do that, let's remember the formula for the area of a circle:

$A=\frac{\pi D^2}{4}$

Replacing the value of the diameter

$A=\frac{\pi(80ft)^2}{4}$

Solving the operation:

$A=\frac{\pi(6400ft^2)}{4}$$A=\pi(1600ft^2)\approx5026.55ft^2$