3) O is the center of the circle. Assume that lines that appear to be tangent are tangent. What is the value of x?

We know that the angles of a quadrilateral add to a 360° angle. 
And there is two right angles at the point of the tangent. 
We deduce the equation:
x+90+90+132=360
then 
x=360-90-90-132=48.
Answer x=48.