formula for area of circular ring
Answers
What is the area of a circular ring?
A ring is what? The area between two concentric circles…? Yeah, must be.
Subtract the area of the small circle from the big one.
To put it in other terms, you have to have the object described. Either by it's width, or by the inner and outer radii, or somehow. Although general terms can be applied, it seems more confusing without the concrete example to help you with.
If:
Area of ring = area of big circle - area of small circle; and
Area of big circle = B
Area of small circle = S
Area of ring = R
Then: R = B - S
The formula for each B and S is described their radii, Aa with any circle:
Area of a circle = πr², where r is the radius
In the end of crunching, you can find that you can calculate it out with either both radii given, or just the width of the ring, which is equal to the displacement of the two radii.
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