Let f{x,y) = √4 - y2.
(A) Explain why the cross sections of the surface z = f{x,y)produced by cutting it with planes parallel to x = 0 are semicircles of radius 2.
(B) Describe the cross sections of the surface in the planes y = 0, y = 2,and y = 3.
(C) Describe the surface z = f{x,y).