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棱柱习题

棱柱习题. 例 ：已知正三棱柱 ABC- 的各棱长都为 1 ， M 是底面上 BC 边的中点， N 是侧棱 上 的点，且 CN= 求证：. 平行六面体与长方体. 一、基本概念. 1 、直平行六面体. 2 、长方体. 3 、正方体. 思考： 它们之间的关系？. 二、定理. 1 、 平行六面体的对角线交于一 点，并且在交点处互相平分 。. 2 、 长方体的一条对角线长的 平方等于一个顶点上三条棱长 的平方和。.

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棱柱习题

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  1. 棱柱习题 例：已知正三棱柱ABC- 的各棱长都为1，M是底面上 BC边的中点，N是侧棱 上 的点，且CN= 求证：

  2. 平行六面体与长方体

  3. 一、基本概念 1、直平行六面体 2、长方体 3、正方体 思考：它们之间的关系？

  4. 二、定理 1、平行六面体的对角线交于一 点，并且在交点处互相平分。

  5. 2、长方体的一条对角线长的 平方等于一个顶点上三条棱长 的平方和。

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