треугольник

#include <iostream>
#include <cmath>
#include <algorithm>
#include <iomanip>

using namespace std;

struct otrezok
{
  double x1, y1, x2, y2, x, y;
  double length;
};

struct vershina
{
  double x, y;
};
double cos_ygla (double ygol)
{
  double znach;
  znach = cos(ygol*3.141592653/180.0);
  return znach;
}
vershina teorema (double cos_ygol, otrezok a, otrezok b)
{
  vershina znach;
  znach.x = b.length*cos_ygol;
  double n = a.length*a.length + b.length*b.length - 2*znach.x*a.length;
  znach.y = sqrt(n - (znach.x - a.length)*(znach.x - a.length));
  return znach;
}
int main ()
{
  otrezok AB, BC;
  double ygol_B;
  cin >> AB.length >> BC.length >> ygol_B;
  vershina B;

  B.x = 0;
  B.y = 0;

  AB.x = AB.length;
  AB.y = 0;

  vershina C;

  double cos_B = cos_ygla(ygol_B);
  C = teorema(cos_B, AB, BC);

  cout.precision(10);
  cout << fixed << B.x << " " << B.y << endl;
  cout << fixed << AB.x << " " << AB.y << endl;
  cout << fixed << C.x << " " << C.y << " ";
}