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Talja [164]
3 years ago
6

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

Mathematics
1 answer:
defon3 years ago
6 0

Answer:

The answer is option b.

<h2>144π</h2>

Step-by-step explanation:

Surface area of a sphere is 4πr²

where r is the radius

diameter = radius / 2

<h3><u>For Big </u><u>sph</u><u>ere</u></h3>

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

<h3>= 144π</h3>

Hope this helps you.

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