In triangle ABC, angle C is 90 degrees, AC = 2, BC = 2√15. Find cos A.

univerkov | November 29, 2020 | education

Find the hypotenuse by the Pythagorean theorem: ab ^ 2 = 4 + 60 = 64
AВ = 8
Cosine is the ratio of the adjacent leg to the hypotenuse: 2/8 = 1/4 = 0.25
Answer: 0.25

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