Use the formula: Surface Area of Sphere = 4πr²

Question

the surface area of a sphere is 7.84π ft.^2 what is the radius of this sphere
2.8 ft.
1.4 ft.
3.2 ft
4.4 ft

Answer 1

To find the radius of the sphere, we need to rearrange the formula:

Surface Area of Sphere = 4πr²
7.84π = 4πr²

Divide both sides of the equation by 4π:

7.84π / (4π) = r²

Simplify:

1.96 = r²

Take the square root of both sides:

√(1.96) = r

Simplify:

1.4 = r

Therefore, the radius of the sphere is 1.4 ft.