Question

Find the length of the diameter of a sphere with a surface area of 24.63 miles2.

1.4 miles

2.8 miles

2.5 miles

1.25 miles



A sphere has cross sections that are circles.

True

False

Answer 1

2.8 miles.

True.

Explanation:

Surface area = 4π r^2 (where r = the radius of the sphere)

24.63 = 4 π r^2

r^2 = 24.63 / 4π

r = √ ( 24.63 / 4π )

= 1.4 miles.

So the diameter = 2*1.4 = 2.8 miles (answer).

The answer to the second part of the question is true.