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Elementary Geometry for College St...

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

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Elementary Geometry for College St...

6th Edition
Daniel C. Alexander + 1 other
ISBN: 9781285195698
Textbook Problem
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Find the approximate perimeter of the sector shown. Answer to the nearest hundredth of an inch.

Chapter 8.5, Problem 19E, Find the approximate perimeter of the sector shown. Answer to the nearest hundredth of an inch.

To determine

To find:

The approximate perimeter of the sector.

Explanation

Definition:

Arc Measure:

In a circle, the degree measure of an arc is equal to the measure of central angle that intercepts the arc.

Formula:

Perimeter of sector:

If r is the radius of circle,

Psector=r+r+lintercepted arc=2r+lintercepted arc

Thus, Psector=2r+lintercepted arc

Length of an arc:

In a circle whose circumference is C, the length l of an arc whose degree measure is m is given by:

l=m360×C

We know that, circumference of a circle is given by 2πr where r is the radius of circle.

Hence, length l of an arc =m360×2πr

Calculation:

Perimeter of sector:

From the diagram it is clear that radius of the circle is 9 in.

The measure of central angle is given as 800.

As per the definition of measure of an arc, the degree measure of an arc is equal to the central angle intercepted by it.

Thus, the degree measure of arc =800

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