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如图分别是正三棱台 正三棱台
(3)侧棱与底面所成的角的正切值; (1)由已知可得O1O=cm.如图,过A1作A1F⊥AD于点F,过D1作D1E⊥AD于点E.在?Rt△A1AF中,A1F=cm,AF=AO-A1O1=cm,∴AA1=cm.(2)在Rt△D1DE中,D1E...
(3)侧棱与底面所成的角的正切值; (1)由已知可得O1O=cm.如图,过A1作A1F⊥AD于点F,过D1作D1E⊥AD于点E.在?Rt△A1AF中,A1F=cm,AF=AO-A1O1=cm,∴AA1=cm.(2)在Rt△D1DE中,D1E...