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Try using M_PI instead of your PI constant.

But when i submitted your code with some edition then it got acc!!!
ok m sending you d code by PM.

And your method is correct.

Still WA .Can you please tell me what should be the output when D>L? Like:- 100 99 or 110 100.

remove the double before sqrtl.... hope you will get acc.

I have changed according to your suggestion,but I am still getting WA .Is there any special cases which I haven't considered.Can you give me some inputs to check?
Thanks for helping me out

Replace the following part of your code: with: And remove your code after acc.

Can anyone please give me any suggestion about why I am getting WA?My code is given below:-
#include<stdio.h>
#include<math.h>


int main(void)
{
double a,b,l,d,pi=2*acos(0);
int n;
scanf("%d",&n);
for(;n;n--)
{

scanf("%lf%lf",&d,&l);
a=l/2;
b=(double)sqrtl((l/2*l/2)-(d/2*d/2));
printf ...

Hi everyone

I know its a very easy problem. it seems ellipse to me . I also know the area of ellipse is pi*a*b.

I know 'a' but how could I get 'b'. plz some one help me.