The Sine and the Cosine of Angles Greater Than 90^o

I need help understanding the following questions:

**6**. The point (20, 21) is on the terminal arm of an angle θ in standard position. Find sin θ and cos θ.

**7.** The point (-8, 6) is on the terminal arm of an angle θ in standard position. Find sin θ and cos θ.

I thought it was draw the point on the graph and then find the angle from the origin (sin 0). But the teacher said no. This is not what it means. She did not know what it meant. As well, what does it mean by sin θ and cos θ? I have no idea what it means.