include <iostream>
#include <cmath>
#define PI 3.14159265
using namespace std;
int main(){
int n;
cout<<"Enter the value of n:"<<endl;
cin>>n;
int theta[3]={20,30,45};
for(int i=0;i<3;i++){
double b,angle,h;
double distance=0;
b=h=0;
if(theta[i]<45){
distance += 10/cos(theta[i]*PI / 180);
b= distance * sin(theta[i] *PI / 180);
b = 10-b;
angle = 90 - theta[i];
}
else{
distance += 10/sin(theta[i]*PI /180);
b= distance * cos(theta[i]* PI /180);
b = 10-b;
angle= theta[i];
}
int num=2;
while(num<=n){
if(angle==45)
distance += 20 *sqrt(2);
else{
h = b / cos(angle*PI /180);
distance += h;
b = distance * sin(angle*PI /180);
b = abs(20-b);
angle = 90 - angle;
}
num++;
}
cout<<distance<<endl;
}
return 0;
}
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