Chapter 8.CR, Problem 39CR

### 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

# Jeff and Helen want to carpet their family room, except for the entrance way and the semicircle in front of the fireplace, both of which they want to tile.a) Approximately, how many square yards of carpeting are needed?b) How many square feet are to be tiled?

To determine

(a)

To find:

The number of square yards of carpeting are needed approximately.

Explanation

Theorem:

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

A=m360Ï€r2.

Postulate:

The area A of a rectangle whose base has length b and whose altitude has length h is given by A=bh.

Formula:

The area of the semi-circle A=12Ï€r2.

Calculation:

Given that Jeff and Helen want to carpet their family room, except for the entrance way and the semicircle in front of the fireplace, both of which they want to tile.

We need to find out the number of square yards of carpeting are needed.

The area of carpeting needed = the area of rectangle â€“ the area of semi-circle â€“ the area of entry way which is in the sector shape.

To find the area of rectangle:

A=bh

Base (b) = 6 ft + 3 ft + 3 ft + 6 ft = 18 ft

Height (h) = 15 ft

A=15Ã—18=270

So, the area of rectangle =270Â ft2.

To find the area of semi-circle:

A=12Ï€r2

Radius (r) = 3 ft.

A=12Ï€(3)2=9Ã—3

To determine

(b)

To find:

The number of square feet are to be tiled.

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