Chapter 8.5, Problem 19E

### 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

# 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+linterceptedÂ arc=2r+linterceptedÂ arc

Thus, Psector=2r+linterceptedÂ 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=m360Ã—C

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

Hence, length l of an arc =m360Ã—2Ï€r

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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