Circle O is tangent to AB at A, and angle ABD = 90 degrees. If AB = 12 and CD = 18, find the radius of the circle.
So, what exactly is the length CD? There is no point "C" ever mentioned within the problem itself.
Sorry, I forgot to Include the circle, this is the circle
The radius of the circle is: r = sqrt [(CD/2)² + (AB)²] = 15
BC = 6