Greetings!
Answer:
402.88mm³
Step-by-step 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:
[tex]\pi r^{2} h[/tex]
So lets find the area of the whole coin.
The radius is 11.5 and height is 2.2
[tex]\pi * 11.5^{2} * 2.2 = 914.05[/tex]
Now, the area of the inner circle:
Radius is 8.6 and height is 2.2:
[tex]\pi * 8.6^{2} * 2.2 = 511.17[/tex]
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
Hope this helps!
