What is the surface area of a sphere with a diameter of 40 inches? Leave the answer in terms of pi. (3.14)

1 answer

The surface area of a sphere with diameter d is given by the formula:

A = 4πr²

where r is the radius of the sphere. Since the diameter is 40 inches, the radius is half of that:

r = 40 inches / 2 = 20 inches

Substituting this value into the formula, we get:

A = 4π(20 inches)²
= 4π(400 square inches)
= 1600π square inches

Therefore, the surface area of the sphere is 1600π square inches.