(1) K = {(x, y, z)| √ x2 + y2 ≤ z ≤ (3) K = {(x, y, z)|x2 + y2 ≤ z ≤ S

(1) K = {(x, y, z)| √ x2 + y2 ≤ z ≤ (3) K = {(x, y, z)|x2 + y2 ≤ z ≤ S