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Elementary Geometry For College St...

7th Edition
Alexander + 2 others
ISBN: 9781337614085

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BuyFindarrow_forward

Elementary Geometry For College St...

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

In Exercises 29 to 34, use the Law of Sines or the Law of Cosines to solve each problem. Angle measures should be found to the nearest degree and areas and distances to the nearest tenth of a unit.

In an A-frame house, a bullet is found embedded at a point 8  ft up the sloped wall. If it was fired at a 30 angle with the horizontal, how far from the base of the wall was the gun fired?

To determine

To find:

The distance from the base of the wall was the gun fired.

Explanation

1) Approach:

The Law of Sines,

sinαa=sinβb=sinγc

Where α, β, and γ are the acute angles of the triangle, and a, b, and c are the sides of the triangle.

2) Calculation:

Given,

In an A-frame house, a bullet is found embedded at a point 8 ft up the sloped wall if it was fired at a 30 angle with the horizontal.

From the figure:

Here, AC¯=b=8ft, BC=a=x,

B=30and C = 65

(i.e.) b=8ft, a=x, β=30 and γ=65

Find x:

For any triangle

α+β+γ=180

α+30+65=180

α+95=180

Add 95 to both sides

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