21 lines
544 B
C++
21 lines
544 B
C++
#include <stdio.h>
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#include <string.h>
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#include <iostream>
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#include <cmath>
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using namespace std;
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const double PI = acos(-1.0);
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double H,R, volume,ans,total;
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int main(){
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while (scanf("%lf%lf",&R,&H) != EOF){
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total = 2*PI*R*R*H;
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if (H >= 2*R){
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volume = R*R*R*2/3;
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}
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else {
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volume = H*H*sqrt(R*R-H*H*1/4)*1/4 + R*R*R*2/3 - R*R*sqrt(R*R-H*H*1/4) + (R*R-H*H*1/4)*sqrt(R*R-H*H*1/4)*1/3;
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}
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ans = total - 8*volume;
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printf("%.4lf\n",ans);
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}
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}
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