You are applying a pesticide to a circular area with a 20-foot diameter. What is the area in square feet?

To determine the area of a circular area, the formula used is A = πr², where A is the area and r is the radius of the circle.

In this case, the diameter of the circular area is given as 20 feet. To find the radius, you divide the diameter by 2. Therefore, the radius is 10 feet (20 feet ÷ 2).

Substituting the radius into the formula gives:

A = π(10 feet)²

A = π(100 square feet)

A ≈ 3.14 × 100 square feet

A ≈ 314 square feet.

This calculation illustrates that the area of the circular space you are treating with pesticide is about 314 square feet, making that the correct answer.