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ABC has three sudes wuth these lengths: AB = 9, BC = 40, and CA = 41. What us the value of cos C
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ABC has three sudes wuth these lengths: AB = 9, BC = 40, and CA = 41. What us the value of cos C
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Apr 6, 2018
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ABC has three sudes wuth these lengths: AB = 9, BC = 40, and CA = 41. What us the value of cos C
Mathematics
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Rigyt
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< C is opposite side AB
so applying the Cosine Rule:-
AB^2 = BC^2 + CA^2 - 2.BC.CA cos C
9^2 = 40^2 + 41^2 - 2.40.41 cos C
cos C = 9^2 - 40^2 - 41^2
----------------------- = 0.97561
-2.40.41
m < C = 12.68 degrees
Dko
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Apr 11, 2018
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