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Viefleur [7K]
3 years ago
14

Given: ΔABC; a= 10; b = 4, and c = 11. Find the measurement of ∠B to the nearest tenth of a degree.

Mathematics
1 answer:
AleksAgata [21]3 years ago
8 0
Use the Cosine Rule to find this

cos <B  = [b^2 - a^2 - c^2] /  -2ac 

               =  [ 4^2 - 10^2 - 11^2] / -2*10*11

               =   0.93182

so m < B  =   21.3 degrees to nearest tenth.  Answer
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