Question

What is the measure of AC in angle CAD?

Answer 1

It seems that more information is needed - is that all the information you have?

Answer 2

Perhaps AD is a secant line.

Answer 3

And AB is 1/2 the secant line.

Answer 4

There has to be a relationship that tells us what the angle is compared to a secant line when the leg of the angle is 1/2 the length of the secant at those points.

Answer 5

I'm guessing the answer is 15. Just a guess.