# Thread: If (a,b) is a point on the terminal side of angle t in standard position, then cos(t)

1. ## If (a,b) is a point on the terminal side of angle t in standard position, then cos(t)

How do I know what it is supposed to be? Please explain. Thank you!

2. ## Re: If (a,b) is a point on the terminal side of angle t in standard position, then co

sketch a reference triangle ...

opposite side = b

hypotenuse = ?

cosine is the ratio = $\dfrac{\text{? side}}{\text{? side}}$

3. ## Re: If (a,b) is a point on the terminal side of angle t in standard position, then co

Cosine is the ration of adjacent/hypotenuse.

Does that then make the answer c. a/sqrt a^2 + b^2?

4. ## Re: If (a,b) is a point on the terminal side of angle t in standard position, then co

Originally Posted by realbrandon
Cosine is the ratio of adjacent/hypotenuse.

Does that then make the answer c. a/sqrt(a^2 + b^2)?
fixed ...