Derive the projection rule in a triangle ABC using cosine rule.
Samaira Shah , 6 Years ago
Grade 11
Trigonometry> Derive the projection rule in a triangle ...
1 AnswersVikas TU
Last Activity: 5 Years ago
Cosine Rule states that
a^2 = b^2 + c^2 - 2bcCosA
b^2 = a^2 + c^2 - 2acCosB
c^2 = a^2 + b^2 - 2abCosC
a^2 = b^2 + c^2 - 2bcCosA
b^2 = a^2 + c^2 - 2acCosB
c^2 = a^2 + b^2 - 2abCosC
Projecton formula gives the relatin between angles and side of a trainge
a= b Cos C + c CosB
B = c CosA + aCosC
c = aCosB + b CosA
B = c CosA + aCosC
c = aCosB + b CosA
Hope this helps
Good luck
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