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Geometry Level 3

In a triangle Δ A B C \Delta ABC satisfying a 3 = b 2 = c 2 \dfrac a3 = \dfrac b2 = \dfrac c2 . Find cos ⁡ A \cos A .

-1/8 1/8 1/2 1/4

Rawan Medhat by Rawan Medhat , 22, Egypt

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1 solution

Prince Loomba
Jan 18, 2016

cos a= b^2+c^2-a^2/2bc

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