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Right-angle Trigonometry

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In $\triangle{ABC}$, $\cos{B}=\frac{3}{5}$ and angle A is 90 degrees. What is $\cos{C}$?

Apr 19, 2021

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cos c = 4/5

cos c = sin b

find sin b      cos^2 + sin^2 = 1

9/25 + sin^2 =1

sin^2 = 16/25

sin b = 4/5                   cos c = sin b = 4/5

Apr 19, 2021