Pre-Calculus, 9th edition
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9
| PAGE: 532 | SET: Exercises | PROBLEM: 9 |
Please look in your text book for this problem Statement
The angle of the triangle 
.
The two sides of the triangle is 
and 
.
Find the side 
by using law of cosines.
Law of cosines: 
.
Substitute 
, 
and 
in above formula.
Find the angle 
by using law of sines.
Law of sines: 
.
Consider 
.
Substitute , and 
in above formula.
.
Sum of the three angles in a triangle 
.
Substitute 
and in above expression.
.
,
and 
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