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Math
GeometryElementary Geometry for College Students6th Edition

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Chapter 11.4, Problem 27E
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Elementary Geometry for College St...

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

Solutions

Chapter
Section
Problem 1E
Problem 2E
Problem 3E
Problem 4E
Problem 5E
Problem 6E
Problem 7E
Problem 8E
Problem 9E
Problem 10E
Problem 11E
Problem 12E
Problem 13E
Problem 14E
Problem 15E
Problem 16E
Problem 17E
Problem 18E
Problem 19E
Problem 20E
Problem 21E
Problem 22E
Problem 23E
Problem 24E
Problem 25E
Problem 26E
Problem 27E
Problem 28E
Problem 29E
Problem 30E
Problem 31E
Problem 32E
Problem 33E
Problem 34E
Problem 35E
Problem 36E
Problem 37E
Problem 38E
Problem 39E
Problem 40E
Problem 41E
Problem 42E
Problem 43E
Problem 44E
BuyFindarrow_forward

Elementary Geometry for College St...

6th Edition
Daniel C. Alexander + 1 other
ISBN: 9781285195698
Textbook Problem
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In Exercises 23 to 28, use a form of the Law of Cosines to find the measure of the indicated side or angle. Angle measures should be found to the nearest degree and lengths of sides to the nearest tenth of a unit.

Chapter 11.4, Problem 27E, In Exercises 23 to 28, use a form of the Law of Cosines to find the measure of the indicated side or

Parallelogram ABCD

To determine

To find:

The value of x the given figure by using the Law of Cosines.

Explanation

Formula:

The Law of Cosines

cosα=b2+c2−a22bc

cosβ=a2+c2−b22ac

cosγ=a2+b2−c22ab

Where α, β, and γ is the acute angle of the triangle, and a, b, and c is the sides of the triangle.

Calculation:

Given,

From the figure,

a=x

b=4

c=6

By the Law of Cosines,

c2=a2+b2−2abcosγ

(6)2=a2+(4)2−2(x)(4)cos60°

36=x2+(4)2−2(x)(4)

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Chapter 11.4,
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