Asked by Anonymous

What is the surface area of a cylindrical ring if its outside diameter is 16 mm and its inside diameter is 10 mm? Round your answer to the nearest whole number.

A. 92 mm^2
B. 118 mm^2
C. 123 mm^2
D. 385 mm^2

I thought it was C. 123 mm^2. However that is not correct, I got it wrong. Please Help.
Answered by Ms. Sue
What is the width of the cylindrical ring?
Answered by Steve
a = pi(8^2 - 5^2) = 122.52

You were correct, if they are asking about the area of the top or bottom surface of the cylinder.

However, maybe they are asking about the area of the curved surface. In that case, it would be

2pi(8-5)h

and you'd need to know the height of the ring.
Answered by Hayes
The correct answer for the above problem is

D. 385 mm^2

I am 100% sure!
Answered by Mayah
Was stuck on this one because the height is not provided....
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