ZOJ Problem Set - 2518
An ellipse can be determined by a pair of a and b, the half lengths of its horizontal and vertical axes, respectively. CYJJ loves ellipses so much that she plans to build a pillar with ellipse base at the center of her living room. She is to wrap the pillar by some wall-paper and you are supposed to tell her the minimum area of paper she has to buy.
100 10 10 10 5 10Sample Output:
Author: CHEN, Yue
Source: CYJJ's Funny Contest #2, Relaxing on Math