Match the following columns.
 

	Column I (Crystal system)		Column II (Edge length)		Column III (Axial angles)
A	Tetragonal	(i)	$\mathrm{a}\ne \mathrm{b}\ne \mathrm{c}$	(1)	$\mathrm{\alpha }=\mathrm{\gamma }={90}^{\mathrm{o}};\mathrm{\beta }\ne {90}^{\mathrm{o}}$
B	Trigonal	(ii)	$\mathrm{a}=\mathrm{b}=\mathrm{c}$	(2)	$\mathrm{\alpha }=\mathrm{\beta }=\mathrm{\gamma }={90}^{\mathrm{o}}$
C	Monoclinic	(iii)	$\mathrm{a}=\mathrm{b}\ne \mathrm{c}$	(3)	$\mathrm{\alpha }=\mathrm{\beta }=\mathrm{\gamma }\ne {90}^{\mathrm{o}}$

[n tetragonal system two sides are equal but one is different. In it all the axial angles are 90^o so, $\mathrm{a}=\mathrm{b}\ne \mathrm{c}$ and $\mathrm{\alpha }=\mathrm{\beta }=\mathrm{\gamma }={90}^{\circ }$
In trigonal system, all the sides and axial angles are equal but not equal to 90^o.$\text{ i.e. }\mathrm{a}=\mathrm{b}=\mathrm{c}\text{ and }\mathrm{\alpha }=\mathrm{\beta }=\mathrm{\gamma }\ne {90}^{\circ }$
In monoclinic system, all the sides are unequal and one bond angle (axial angle) is not equal to 90^o i.e.$a\ne b\ne c$ and $\mathrm{\alpha }=\mathrm{\gamma }={90}^{\circ },\mathrm{\beta }\ne {90}^{\circ }$