Plan	Valeur des coefficients	Equation
A l'origine	D = 0	Ax + By + Cz = 0
au plan Oxy	C = 0	Ax + By + D = 0
au plan Oxz	B = 0	Ax + Cz + D = 0
au plan Oyz	A = 0	By + Cz + D = 0
// au plan Oxy	A = B = 0	Cz + D = 0
// au plan Oxz	A = C = 0	By + D = 0
// au plan Oyz	B = C = 0	Ax + D = 0
Contenant l'axe x	A = D = 0	By + Cz = 0
Contenant l'axe y	B = D = 0	Ax + Cz = 0
Contenant l'axe z	C = D = 0	Ax + By = 0
Plan Oxy	A = B = D = 0	z = 0
Plan Oxz	A = C = D = 0	y = 0
Plan Oyz	B = C = D = 0	x = 0