View Compilation Error

187116_0_29465.cpp:2:16: math: No such file or directory
187116_0_29465.cpp: In function `int main()':
187116_0_29465.cpp:16: error: `sqrt' undeclared (first use this function)
187116_0_29465.cpp:16: error: (Each undeclared identifier is reported only once for each function it appears in.)