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3 years ago

Help!!!!! please!!!!!

Mathematics

1 answer:

defon3 years ago

6 0

Answer:

The answer is option b.

Step-by-step explanation:

Surface area of a sphere is 4πr²

where r is the radius

diameter = radius / 2

radius = 15 / 2 = 7.5in

Surface area = 4π(7.5)²

= 225π

<h3><u>Small </u><u>sph</u><u>ere</u></h3>

radius = 9/2 = 4.5in

Surface area = 4π(4.5)²

= 81π

Difference of the surface areas is

Surface area of big sphere - surface area of small sphere

Which is

225π - 81π

Hope this helps you.

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3 years ago

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e-lub [12.9K]

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