Need help bad!!

I have a question....You have to explain how you would find the measure of an angle formed on the circle by the intersection of a tangent and a secant. I can't find it anywhere please help!!

Thanks

Draw the radius to the point of intersection. This should give you a right angle with the tangent.

Draw the radius to the other end of the secant. This should give you an isosceles triangle with the secant as base.

There's got to be enough information in there.