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(2014?盐城一模)如图,在正三棱柱ABC-A 如图 在正三棱柱abc a1b1c1
(2014?盐城一模)如图,在正三棱柱ABC-A 证明:(1)连接A1C与AC1交于点O,连接OF,F为AC的中点,OF∥C1C且OF=12C1C,E为BB1的中点,BE∥C1C且BE=12C1C,BE∥OF且BE=OF,四边形BEOF是平...
(2014?盐城一模)如图,在正三棱柱ABC-A 证明:(1)连接A1C与AC1交于点O,连接OF,F为AC的中点,OF∥C1C且OF=12C1C,E为BB1的中点,BE∥C1C且BE=12C1C,BE∥OF且BE=OF,四边形BEOF是平...