Constant Value Meaning
M_PI 3.14159265358979323846 pi
M_PI_2 1.57079632679489661923 pi/2
M_PI_4 0.78539816339744830962 pi/4
M_1_PI 0.31830988618379067154 1/pi
M_2_PI 0.63661977236758134308 2/pi
M_SQRTPI 1.77245385090551602729 sqrt(M_PI)
M_2_SQRTPI 1.12837916709551257390 2/sqrt(M_PI)
M_SQRT2 1.41421356237309504880 sqrt(2)
M_SQRT3 1.73205080756887729352 sqrt(3)
M_SQRT1_2 0.70710678118654752440 1/sqrt(2)