Chapter 8.4, Problem 29E

### 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

# Assuming that a 90° arc has an exact length 4π in., find the length of the radius of the circle.

To determine

To Find:

The length of the radius of the circle.

Explanation

Given:

A 90Â° arc has length of 4Ï€ in.

Calculation:

We know that a circle is made up of four 90Â° arcs.

Therefore, the circumference of the circle can be obtained by multiplying the arc length by 4.

The circumference of the circle is 4â‹…4Ï€ in.

(i.e.,) 16Ï€ in.

The circumference of the circle is C=Ï€d

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