Please help me with this pls

Monica build a remote control toy airplane for science project to test the plane she launched it from the top of a building the plane travel a horizontal distance of 50 feet before landing on the ground a quadratic function which models the height of the plane in feet relative to the ground at a horizontal distance of x feet from the building is shown

The pyramid below was dissected by a horizontal plane which shape describes the pyramid horizontal cross section

Solve this problem! extra ! 3025/5.5 = a/90.75