Tangency Problem 13

Figure shows a template ABCDEFGHI.
Points B, C, D, E, F, G , H and I are tangent points. FE is a tangent line.
A is the vertex point of semi parabola and BC is an quadrant of ellipse.
Draw the template in full size.

1. Measure the length of EF

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