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- #include<stdio.h>
- int main()
- {
- int i,T;
- scanf("%d",&T);
- if(T<=100)
- {
- for(i=1;i<=T;i++)
- {
- double area1,area2,r,area,pI=3.1416;
- scanf("lf",&r);
- area1=( 4*r*r)
- area2=(pI*r*r);
- area=area1-area2;
- printf("case %d : %.4lf",i,area);
- }
- }
- }
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