To find: and correct the error in given solution for finding the measure of angle A in
In the given solution
Correct solution is:
Given information:
The given measurements are:
The given solution is:
Definition Used:
Law of Cosines:
If
has sides of length a , b , and c as shown, then:
Explanation:
By the law of cosines
Substitute the given values for a , b and c . And simplify,
Here it must be noticed that in the given solution
So,
Use inverse cosine,
Chapter 9 Solutions
Holt Mcdougal Larson Algebra 2: Student Edition 2012
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