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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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The approximate area of a triangle with sides of lengths 3 in., 5 in., and 6 in. is 7.48 in2. What is the approximate length of the radius of the inscribed circle?

To determine

To find:

The approximate length of radius of the inscribed circle.

Explanation

Formula:

Area of a triangle with an inscribed circle:

If P is the perimeter of the triangle and r is the length of radius of its inscribed circle, then the area A of the triangle is given by

A=12rP

Calculation:

The lengths of sides of triangle is given as 3 in., 5 in., 6 in.

Perimeter of triangle is sum of lengths of all sides of triangle.

Thus, perimeter P=3+5+6=14 in.

The area of triangle A is given as 7.48 in2.

Let the radius of inscribed circle be r in.

Let’s substitute the values of P and A in the formula.

A=12rP

Substitute the values of P and A:

7

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