rmaxson75 rmaxson75

25-10-2021
Advanced Placement (AP)

contestada

In triangle ABC, angle C is a right angle. If cos A=5/8, what is the value of cos B?
(sqrt(x) = square root of x)
A. 3/8
B. 5/8
C. sqrt(39)/8
D. sqrt(89)/8

Respuesta :

25-10-2021

Answer:

C is the correct option.

Explanation:

cos A = 5/8

from,

a² + b² = c²

a² + 5² = 8²

a² = 64 - 25

a = √39

then, a = √39

c = 8

cos B = √39/8

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