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Elementary Geometry for College St...

6th Edition
Daniel C. Alexander + 1 other
ISBN: 9781285195698

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BuyFindarrow_forward

Elementary Geometry for College St...

6th Edition
Daniel C. Alexander + 1 other
ISBN: 9781285195698
Textbook Problem
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Given concentric circles with radii of lengths R and r, where R > r , explain why A r i n g = π ( r + r ) ( R r ) .

Chapter 8.4, Problem 31E, Given concentric circles with radii of lengths R and r, where Rr, explain why Aring=(r+r)(Rr).

To determine

To explain:

Aring=π(R+r)(Rr), for concentric circles with the radii of lengths R and r.

Explanation

Two circles with a common center are called concentric circles.

A region bounded by two concentric circles is called ring.

Calculation:

The length of the radius of the outer circle is R.

The area of the outer circle is πR2.

Next, the length of the radius of the inner circle is r.

The area of the inner circle is πr2.

Now to find the area of the ring, subtract the area of the inner circle from the area of the outer circle.

Therefore, Aring=πR2πr2

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