Cuts the cake

Problem Description

    Ice cream took a bronze medal in the Beijing match. Liu sir is very very happy. So he buys a cake for them. kiki is a child who likes eating, so the task of cuting cake  was given to kiki. kiki is also a mischievous child. She wants to cut the cake in a different way. This is introduced in the figure below.

But there is a difficult problem.which is how to  make each preson get equally many cake. kiki is not good at match, so she wants you help her solve this problem.

 

Input

   Input contains multiple test cases. Each line is a case.　Each case contains only one integer R which is the radius. The input is terminated with a R of 0.

 

Output

   For each test case, you should printf two numbers r2 and r1 in a line, accurate up to 3 decimal places, separate them by one space.

 

Sample Input

10
15
5
25
0

 

Sample Output

5.774 8.165
8.660 12.247
2.887 4.082
14.434 20.412

 

Author

☆RPG♀月野兔☆

 

Source

HDU 2007-11  Programming Contest_WarmUp

 

Recommend

威士忌

#include <stdio.h>
#define PI 3.1415926
#include<math.h>
int main()
{
	double a,r1,r2;
	while(scanf("%lf",&a)&&a)
	{
		double s=a*a*PI;
		double r1=sqrt(2.0/3.0*s/PI);
		double r2=sqrt(s/3.0/PI);
		printf("%.3lf %.3lf\n",r2,r1);
	}
	return 0;
}