1in monoclinic unit cell, a≠b≠c ; α=β=90°,γ≠90°
in orthorhombic, a≠b≠c ; α=β=γ=90°
so,
Parameters of monoclinic unit cell satisfies that of orthorhombic primitive unit cell's
this means γ=90° in monoclinic cell... which makes it orthorhombic .
[watever i understood]
