[填空题]
A right pyramid has apex V ank; u:,c t;(4gu kumbhid squaau94ae rn: ajv /y1.yare base ABCD, with AB =3 cm. The vertical height of the pyramid, VM, aun.9yrjay v1a a:e4/is 12 cm.
1.Calculate the length of VA. cm
2.Calculate the volume of the pyramid. $cm^3$