Question

The point (3, -4) is on the terminal side of an angle theta . What is cos theta ?



A.
-3/5





B.3/5





C.-3/4





D.3/4





E.
3

Answer 1

cos = x/r(or hypo)

Answer 2

how do you find r?

Answer 3

r^2=a^2+b^2=c^2(this is r)
r^2= 3^2 + (-4)^2 = c^2