Tangency Problem 08

Figure shows a template ABCDEF. A, C, D, E and F are points of
tangency. EF is a tangent line. A is the vertex of the half parabola.
Draw the template in full size.

1. What is the distance between points O and Q?
2. What is the diameter of Rx?

Mail your answer to: noh4568@yahoo.com.
The correct answer will get the participation certificate.