Question

In a triangle ABC, a cos A + b cos B+c cos C =s. Prove that
the triangle is equilateral.​

Answer 1

Answer:

Let ,

cos A + cos B + cos C Be 3x.

we know that,

Sum of all angles of a triangle = 180 Degree (s)

Therefore ,

3x = 180

x = 180/3 = 60 Degree

Hence ,

cos A + cos B + cos C = s

3 X 60 = 180

180 = 180 Proved..... Ans....

Answer 2

Answer:

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