ACM 10678 - The Grazing Cow

#include <stdio.h>
#include <math.h>

int main()
{
    double a, b, area, D, L, pi = 2 * acos(0.0);
    int caseNum;
    scanf("%d", &caseNum);
    while (caseNum --)
    {
        scanf("%lf %lf", &D, &L);
        a = L / 2;
        b = sqrt((L / 2) * (L / 2) - (D / 2) * (D / 2));
        printf("%.3lf\n", a * b * pi);
    }
    return 0;
}

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