Chapter 8.4, Problem 30E

### Elementary Geometry For College St...

7th Edition
Alexander + 2 others
ISBN: 9781337614085

Chapter
Section

### Elementary Geometry For College St...

7th Edition
Alexander + 2 others
ISBN: 9781337614085
Textbook Problem

# The ratio of the circumferences of two circles is 2:1. What is ratio of their areas?

To determine

To Find:

The ratio of the areas of the circle.

Explanation

Given:

The circumference of the two circles is 2:1.

Formula used:

The circumference of the circle is C=2Ï€r.

The area of the circle is A=Ï€r2.

Calculation:

We know that, the circumference of the circle is C=2Ï€r.

Let r1 and r2 be the radius of the two circles,

Then, the radius of the two circles is r1=2C2Ï€=CÏ€â€Šâ€Šâ€Šin.â€Šâ€‰â€Šandâ€Šâ€Šâ€Šâ€Šâ€Šâ€Šâ€Šr2=C2Ï€in

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