The figure shows a design for a monument.

A pictorial sketch of the monument is also shown.

The curve ABC is a parabola with vertex B.

The curve PQRST is a semi-ellipse with minor axis 80. Normals to the elliptical curve are drawn at points Q and S.

Draw the given design.

Show clearly the constructions necessary to determine the major axis of the ellipse and the normals at Q and S.