
```cpp
    include<bits/stdc++.h>
using namespace std;
int main(){
double r;
double PI=3.14159;
printf("%.4f ",r2);
printf("%.4f ",r2PI);
printf("%.4f",rr*PI);
return 0;
}


```


g                                                  u                                                                 n

#include<bits/stdc++.h>
using namespace std;
int main(){
    double r;
    double PI=3.14159;
    printf("%.4f ",r*2);
    printf("%.4f ",r*2*PI);
    printf("%.4f",r*r*PI);
    return 0;
}

圆的计算

代码

#include<bits/stdc++.h>
using namespace std;
int main(){
double r;
double PI=3.14159;
printf("%.4f ",r2);
printf("%.4f "

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