Question

The point (12, 5) is on the terminal side of an angleθ. What is
cos θ?

a. 12
b. 12/5
c. 12/13
d. 13/12

Answer 1

Do you remember the definition for cosine?

Answer 2

cos(a)= b/c

Answer 3

right?

Answer 4

Yep, and in this case?

Answer 5

cos(12)=5/13??

Answer 6

You don't apply cosine to a side; you apply it to an angle

Answer 7

That means cos(θ) instead of cos(12)

Answer 8

And you applied it to the wrong sides; it should be 12/13

Answer 9

so cos(θ)=12/13

Answer 10

Yep