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In ΔABC, a = 6.9 inches, b = 2.8 inches and ∠C=7°. Find the length of c, to the nearest 10th of an inch.

In ΔABC, a = 6.9 inches, b = 2.8 inches and ∠C=7°. Find the length of c, to the nearest 10th of an inch.
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1 vote
In ΔABC, a = 6.9 inches, b = 2.8 inches and ∠C=7°. Find the length of c, to the nearest 10th of an inch.

User Jashandeep Sohi
by
8.8k points

1 Answer

5 votes
use law of consine, c²=a²+b²-2abcosC=6.9²+2.8²-2*6.9*2.8cos7
use your calculator: c≈4.1
please use your calculator to double check my answer.
User Pmagunia
by
8.4k points
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