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Grade: 11
        
Derive the projection rule in a triangle ABC using cosine rule.
2 years ago

Answers : (1)

Vikas TU
9775 Points
							
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
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

Hope this helps 
Good luck 
 
4 months ago
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