36.7k views
3 votes
Find the surface area of a

sphere with a diameter of
15 in.
Can someone please explain how?

2 Answers

5 votes

Answer:

SA=706.86 in²

Explanation:

surface area of a sphere = 4πr²

radius r=d/2=15/2=7.5

SA=4(π)(7.5)²

SA=706.86 in²

User JesuLopez
by
8.9k points
4 votes

Answer:

About 706.5 square inches.

Explanation:

Surface area of a sphere is:
SA=4\pi r^2

The radius is half the diameter. So, the radius of the given sphere is 7.5 in.

15/2 = 7.5

Find the surface area:

I use 3.14 for pi.


SA=4*3.14*7.5^2\\\\SA=4*3.14*56.25\\\\SA=12.56*56.25\\\\\boxed{SA=706.5}

The surface area is about 706.5 square inches.

Hope this helps.

User Mauek Unak
by
8.3k points

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