Question

If sinθ = 3/4 what are the values of cos θ

Answer 1

Do you know the Pythagorean theorem?

Answer 2

Yeah

Answer 3

you can use that to find your adjacent side. Once you find that, you can find your cos

Answer 4

so \[3^{2}+b ^{2}=4^{2} \]to find the adjacent side

Answer 5

Okay, go on

Answer 6

\[b=\sqrt{5}\] so what would cos be?

Answer 7

2.23

Answer 8

right. I would leave it as sqrt of 5 unless it tells you to find the sqrt

Answer 9

Oh okay, that's the answer then?

Answer 10

well, it's asking for cos. so from that picture, what is cos of theta?

Answer 11

I don't know how to find that..

Answer 12

\[\cos \theta=\frac{ adj }{ hyp }\]\[\cos \theta=\frac{ \sqrt{5} }{ 4 }\]That's your answer

Answer 13

Awesome! Is that it?

Answer 14

yep

Answer 15

Thank you!