View Compilation Error

421990_0_0_19393.cpp:2:16: math: No such file or directory
421990_0_0_19393.cpp: In function `double distance(Point, Point)':
421990_0_0_19393.cpp:8: error: `sqrt' undeclared (first use this function)
421990_0_0_19393.cpp:8: error: (Each undeclared identifier is reported only once for each function it appears in.)