Section B - Question 6
The figure shows a design based on the elevation of a sports stadium. The curve ABCDE is based on a semi-ellipse with major axis 100 and minor axis 60. The focal points F and G are indicated. The lines BR and DR are tangential to the ellipse at points B and D respectively. The curve QRS is based on the same semi-ellipse.
The curves AP and ET are semi-parabolas with vertices at A and E respectively.
