第一题：看这个正三棱台的俯视图,是个“回”字形图,也就是两个正方形套在一起.两个正方形对角线差的一半根号2.由于侧棱和底面成角是45度,所以正三棱台的高就是根号2,用体积公式就可以求出三棱台的体积.
第二题：同样这个正三棱台的俯视图,也是个“回”字形图,两个正方形的边长差的一半是0.5.由于侧面与底面成角是60度,所以这个正三棱台的的斜高是1,由侧面积公式就可以求得此棱台侧面积.
立体几何题,HELP!要求具体过程,COME ON!
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