[填空题]
A right pyramid has apex(khkp +cuwdr zx7: 5x/ V and squar3-ldvya /3eckk8fnh*0n yc.ee base ABCD, with AB =3 cm. The vertical height of t3l yv -k83nhc*edkan.0fc ye/he pyramid, VM, is 12 cm.
1.Calculate the length of VA. cm
2.Calculate the volume of the pyramid. $cm^3$