Question

If sin θ = 21 over 29, use the Pythagorean Identity to find cos θ.

A. cos θ = ± 8 over 29
B. cos θ = ± 21 over 20
C. cos θ = ± 29 over 20
D. cos θ = ± 20 over 29

Answer 1

@ThereisnoUsername

Answer 2

sin Θ = 21 over 29,

that tells you the "opposite side" is 21
and the 29 is the hypotenuse

so lets draw a triangle and fill in these numbers