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Elementary Geometry for College St...

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

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BuyFindarrow_forward

Elementary Geometry for College St...

6th Edition
Daniel C. Alexander + 1 other
ISBN: 9781285195698
Textbook Problem
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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) How many square yards of carpeting are needed?

b) How many square feet are to be tiled?

Chapter 8.CR, Problem 39CR, Jeff and Helen want to carpet their family room, except for the entrance way and the semicircle in

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=m360πr2.

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=12πr2.

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 – the area of semi-circle – the area of entry way which is in the sector shape.

To find the area of rectangle:

A=bh

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

Height (h) = 15ft

A=15×18=270

So, the area of rectangle =270 ft2.

To find the area of semi-circle:

A=12πr2

Radius (r) = 3ft.

A=12π(3)2=9×3

To determine

(b)

To find:

The number of square feet are to be tiled.

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