#include <bits/stdc++.h>
using namespace std;
const long long mod = 998244353;
long long add(long long a, long long b, long long mod) {
  return (a % mod + b % mod) % mod;
}
long long sub(long long a, long long b, long long mod) {
  return (a % mod - b % mod + mod) % mod;
}
long long mul(long long a, long long b, long long mod) {
  return (a % mod * b % mod) % mod;
}
long long power(long long a, long long b, long long MOD) {
  long long res = 1;
  while (b) {
    if (b & 1) {
      res *= a;
      res %= MOD;
    }
    a = a * a;
    a %= MOD;
    b >>= 1;
  }
  return res;
}
const long double pie = 3.1415926535897932384626433832795;
signed main() {
  ios_base::sync_with_stdio(false);
  cin.tie(NULL);
  cout.tie(NULL);
  ;
  long double w, h, a;
  cin >> w >> h >> a;
  cout << setprecision(10) << fixed;
  if (w <= h) swap(w, h);
  if (floorl(a) == 180 || floorl(a) == 0) {
    cout << w * h << '\n';
    return 0;
  }
  if (floorl(a) == 90) {
    cout << h * h << '\n';
    return 0;
  }
  if (a >= 90) {
    a = 180 - a;
  }
  a *= (pie / 180);
  if (tan(a / 2) <= h / w) {
    long double x1 = (-h / 2) * tan(a / 2);
    long double y1 = h / 2;
    long double x2 = -w / 2;
    long double y2 = h / 2;
    long double x3 = -w / 2;
    long double y3 = (-w / 2) * tan(a) + (h / (2 * cos(a)));
    long double A = abs(x1 * (y2 - y3) - x2 * (y1 - y3) + x3 * (y1 - y2));
    x1 = w / 2;
    y1 = (w / 2) * tan(a / 2);
    x2 = (w / (2 * cos(a))) - (h / 2) * tan(a);
    y2 = h / 2;
    x3 = w / 2;
    y3 = h / 2;
    A += abs(x1 * (y2 - y3) - x2 * (y1 - y3) + x3 * (y1 - y2));
    cout << w * h - A << '\n';
    return 0;
  }
  cout << h * h / sin(a) << '\n';
  return 0;
}
