[填空题]
A right pyramid has apex V and squar3is9 5b7qs xstiohq71 e bagn6t: -u5 n-y4lvxj sjse ABCD, with AB =3 cm. The vertical height of the pyramid, VM,uvs5j-6 g:n4xj- n ytl is 12 cm.
1.Calculate the length of VA. cm
2.Calculate the volume of the pyramid. $cm^3$