SOLUTION: Dear Math Tutor,
A circular ring has a cross section. if outer radius is 22mm and the inner radius is 20mm, calculate the cross sectional area of the ring.
what is the cross
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Question 776744: Dear Math Tutor,
A circular ring has a cross section. if outer radius is 22mm and the inner radius is 20mm, calculate the cross sectional area of the ring.
what is the cross sectional area of a ring?
sincerely,
Nancy
Answer by KMST(5328) (Show Source): You can put this solution on YOUR website!
Cut down the middle, one half of the ring may look like this:
The red circles are the places where it was cut. The diameter of those red circles is .
If by cross section they mean the area of just one of those circles, it is
because the are of a circle is and the radius (half the diameter) is .
If by cross section they mean the area of both of those circles, it is
.
The approximate answers are
and or I would round those numbers as desired.
If an exact answer is required, I would write the results as
and
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