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Elementary Geometry For College St...

7th Edition
Alexander + 2 others
ISBN: 9781337614085

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Section
BuyFindarrow_forward

Elementary Geometry For College St...

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

In Exercises 23 and 24, find the exact areas of the shaded regions.

To determine

To find:

The exact area of the shaded region.

Explanation

Formula:

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 square:

If the length of side of a square is a, then the area of square is given by the formula:

Asquare=a2

Calculation:

To find the area of the shaded region, we have to subtract the area of 4 sectors from the area of square.

Ashaded region=Asquare-Afour sectors

Let’s find the area of square.

The length of side of square is given as 12 m.

Asquare=a2=122=144 m2.

The horizontal and vertical segments drawn inside the square are such that they intersect the side of square at is midpoint. And hence, it is clear that the radius of each sector is equal to half of the length of side of square, that is, r=122=6 m.

Since, the horizontal segment is parallel to the sides of square, the angle formed by the horizontal segment with the side of square is 900. Thus, m=900

Let’s substitute the value of r and m to find the area of sector

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