View Compilation Error

0_0_33701435_2183.cpp: In function 'int main()':
0_0_33701435_2183.cpp:9:34: error: expected primary-expression before '/' token
   printf("%.2lf\n",n*n / pi / 2);/
                                  ^
0_0_33701435_2183.cpp:10:2: error: expected primary-expression before '}' token
  }
  ^