braggs143otcr4f braggs143otcr4f

05-05-2020
Mathematics

contestada

30.54
Which relationship in the triangle must be true?
sin(B) = sin(A)
sin(B) = cos(90 -B)
cos(B) = sin(180 - B)
cos(B) = cos(A)

Respuesta :

jimthompson5910 jimthompson5910

05-05-2020

Answer: Choice 2) sin(B) = cos(90-B)

Explanation:

The rule is that

sin(A) = cos(B)

if and only if A+B = 90.

Solving for A gets A = 90-B

So we end up with

sin(90-B) = cos(B)

which is the same as

cos(B) = sin(90-B)

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