   Chapter 8.5, Problem 22E ### Elementary Geometry for College St...

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

#### Solutions

Chapter
Section ### Elementary Geometry for College St...

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

# Find the exact perimeter and area of the segment shown, given that m ∠ O = 120 ° and A B = 10 in. To determine

To find:

The exact perimeter and area of the shaded segment.

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 segment:

The perimeter of a segment is the sum lengths of chord and its associated arc.

Psegment= Length of chord + Length of associated 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

Area of segment:

Asegment=Asector-P

Area of sector:

If r is the radius of the circle, the area A of a sector whose arc has degree measure m is given by

A=m360×πr2

Area of triangle:

If a, b and c are lengths of sides of triangle, then area of triangle is given by the formula:

A=s(s-a)(s-b)(s-c)

Where s is the semi perimeter which is given by s=12(a+b+c)

Calculation:

Perimeter of segment:

OA is the radius of circle. Thus, r=12 in

The measure of central angle is mO=1200.

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 AB^ =1200. Hence, m=1200

Length l of an arc is given by the formula m360×2πr

Let’s substitute the value of m and r to find the length of arc.

Thus, the length of arc = 120360×2π×12

Simplify: l(AB^)=8π in.

The length of chord AB is given as 10 in.

Psegment=AB+l(AB^)

Psegment=(10+8π) in

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