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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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If the length of the base of a rectangle is increased by 20 percent and the length of the altitude is increased by 30 percent, by what percentage is the area increased?

To determine

The percentage of the area increased.

Explanation

Converting theoretical statement into mathematical statement and the calculation is followed by suitable geometric formulae.

Calculation:

Given,

Percentage of base of the rectangle increased =20

Percentage of the height of (altitude of) the rectangle increased =30

Let b be the base of the rectangle and h be the height (altitude) of the rectangle.

Increased length of the base =b+20100(b)

=b+0.2b

=(1+0.2)b

base=1.2b

Increased length of the height =h+30100h

=h+0.3h

=(1+0.3)h

=1.3h

Area of the rectangle A1=bh

The area of the rectangle after the change

A2=Base×Height

=1

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