For orthorhombic system axial ratios are $a\ne b\ne c$ and the axial angle are

Orthorhombic crystal has three unequal axis which are at right angle to each other $a\ne b\ne c$, all angles $={90}^{\circ }$

So, axial distances $a\ne b\ne c$ and axial angles $\alpha =\beta =\gamma ={90}^{\circ }$