Question

A sphere has a surface area of 80 square feet. Which choice is the closest to its radius? Use 3.14 to approximate pi.

Answer 1

Answer: 2.524 ft
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The equation for the surface area of a sphere is $SA = 4 \pi r^2$.
SA = surface area
r = radius

You're told that the surface area, SA = 80 square feet. Plug that into the equation and solve for r:
$80 = 4 \pi r^2\\ 20 = (3.14) r^2\\ r^2 = \frac{20}{3.14} \\ r = \sqrt{ \frac{20}{3.14}}\\ r \approx 2.524 \: ft$

Answer 2

Answer: 2.52 feet

Step-by-step explanation:

This is a imagine math answer answer