#include <stdio.h>
#include <math.h>
 
#define PI 3.1416
 
int main() {
    int T;
    scanf("%d", &T);
 
    for (int case_no = 1; case_no <= T; case_no++) {
        int x, d, h, w, a;
        scanf("%d %d", &x, &d);
        scanf("%d %d", &h, &w);
        scanf("%d", &a);
 
        // Calculate the distance to the farthest point of the rectangle
        double half_h = h / 2.0;
        double half_w = w / 2.0;
        double rectangle_farthest = d + sqrt(half_h * half_h + half_w * half_w);
 
        // Calculate the distance to the farthest point of the equilateral triangle
        double triangle_height = a * sqrt(3.0) / 2.0; // height of the equilateral triangle
        double triangle_farthest = (x - d) + triangle_height / 3.0; // centroid is at 1/3 of the height
 
        // Determine the maximum radius
        double max_radius = fmax(rectangle_farthest, triangle_farthest);
 
        // Calculate the area
        double area = PI * max_radius * max_radius;
 
        // Print the result
        printf("Case %d: %.4f\n", case_no, area);
    }
 
    return 0;
}