1 Answer

Ngungo · Answer 1 · 2019-05-15T03:04:27+0000

Greetings!

Answer:

402.88mm³

Explanation:

To find the answer to this, we need to find the total area of the coin and then the size of the inner coin.

As this is a cylinder, the formula is:

$\pi r^(2) h$

So lets find the area of the whole coin.

The radius is 11.5 and height is 2.2

$\pi * 11.5^(2) * 2.2 = 914.05$

Now, the area of the inner circle:

Radius is 8.6 and height is 2.2:

$\pi * 8.6^(2) * 2.2 = 511.17$

Now to find the area of the silver ring in the coin, you subtract the inner circle measurement from the whole coin measurement:

914.05 - 511.17 = 402.88

So the volume of the outer ring is 402.88mm³