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Find BC. PLEASE HELP ASAP!! A. 28 in B. 29 in C. 30 in D. 22.5 in

Find BC. PLEASE HELP ASAP!! A. 28 in B. 29 in C. 30 in D. 22.5 in
asked 228k views
4 votes
Find BC. PLEASE HELP ASAP!!
A. 28 in
B. 29 in
C. 30 in
D. 22.5 in

Find BC. PLEASE HELP ASAP!! A. 28 in B. 29 in C. 30 in D. 22.5 in-example-1
asked
User Crowjonah
by
8.7k points

1 Answer

2 votes

Answer:

Choice B. 29

Explanation:

Use law of cosines:


a^2=b^2+c^2-bcCosA


a=√(b^2+c^2 -bcCosA)


a=√(19^2+12^2-(19)(12)Cos138)


a=29.0495

answered
User Airtonix
by
8.3k points
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