The object is 3D. Have graphed the top part and its projection into the xy plane. You are asked to project this into the yz and xz planes as well. I hope this picture gets you started. P.S here is the maple code for the graph if you have it.
Originally Posted by Kuma
a := plot3d(4-y^2, y = 0 .. 2*x, x = 0 .. 1, axes = normal);
b := plot3d(0, y = 0 .. 2*x, x = 0 .. 1, axes = normal, transparency = .9);