He may be a little beyond what you're studying.  I think you're just studying
right-triangle trig, not circular functions, and haven't gotten to putting them
on a graph yet, so I'll do them assuming you are just doing right triangle trig.

Since sine is opposite/hypotenuse, draw a right triangle with the opposite side
as 1 and the hypotenuse as 5 and the angle on the left θ:



Then use the Pythagorean theorem to find the adjacent side to θ:







Edwn