[填空题]
A right pyramid has apex V and square base ABCD. The vert9 bh9ozg1j hy(iykrp1i:* vd 2ecal height of the pyramid, VM, is *k :2iy rvdp1e5 cm. The sloping edges are 8 cm long.
1.Calculate the length of MC. cm
2.Calculate the size of the angle that sloping edge VC makes with the
vertical height of the pyramid. $^{\circ}$
3.Calculate the area of the triangle ABC. $cm^2$