using PI

[mynahz]

pardon me everyone, i have a silly question.

if i want to use pi in calculations, do I put

#include <math.h>
or
#include "math.h"
?

and do I need to check if there is actually a math.h in the program I am using?

[mynahz]

oops. i found out the problem. my math.h actually calls it M_PI. problem solved!