Engineering Board Exam Reviewer · Solutions to Oblique Triangles · easy
In triangle ABC, a=7, b=9 and C=60°. Find side c.
- 67
- 13.89
- 11.4
- 8.19
Answer
D. 8.19
Solution
By the law of cosines, c2=a2+b2-2ab C=49+81-63=67, so c=sqrt(67)=8.19.
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