如图所示是三棱锥d abc的三视图点o在三个视图中都是所在边的中点则异面直线do 和ab所成角的余弦值等于 A b C D Sketch Coloring Page

如图所示是三棱锥d abc的三视图点o在三个视图中都是所在边的中点则异面直线do 和ab所成角的余弦值等于 A b C D Template

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tomski如图所示是三棱锥d abc的三视图点o在三个视图中都是所在边的中点则异面直线do 和ab所成角的余弦值等于 coloring

如图所示是三棱锥D ABC的三视图点O在三个视图中都是所在边的中点则异面直线DO 和AB所成角的余弦值等于 A B C D sketch template

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如图所示在三棱锥P ABC中PA⊥平面ABC E为AC的中点 1求异面直线BE与PC所成角的余弦值 2求二面角P BE C sketch template

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如图已知三棱锥的底面是直角三角形直角边长分别为3和4过直角顶点的侧棱长为4且垂直于底面该三棱锥的主视图是ABCD——青夏教育 sketch template

如图，在三棱锥P ABC中，AB=BC=2√ 2，PA=PB=PC=AC=4，O为AC的中点（1）证明：PO⊥ 平面ABC；（2）若点M在棱 sketch template

已知正三棱锥P－ABC的底面边长为6，其内切球的半径为1，则此三棱锥的高为． sketch template

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三棱锥三视图怎么画三棱锥的三视图五棱锥怎么画大山谷图库 sketch template

如图所示在三棱台A′B′C′ ABC中沿A′BC截去三棱锥A′ ABC则剩余的部分是 A．三棱锥B．四棱锥C．三棱柱D．组合体题目 sketch template

如图所示在三棱台A′B′C′ ABC中沿A′BC截去三棱锥A′ ABC则剩余的部分是 A．三棱锥B．四棱锥C．三棱柱D．组合体题目 sketch template

如图已知三棱锥的底面是直角三角形直角边长分别为3和4过直角顶点的侧棱长为4且垂直于底面该三棱锥的主视图是ABCD——青夏教育 sketch template

如图所示正三棱锥 P−ABC 中， M 是 PC 上一点， PM=2MC ，且 PB⊥AM ， AB=2 ，则三棱锥 的外接球的 sketch template

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如图，已知正三棱柱ABC A 1B 1C 1的所有棱长都为2，D为CC 1中点，E为BC的中点（1）求证：BD⊥ 平面AB 1E；（2）求三 sketch template

81 基本立体图形1 棱柱、棱锥、棱台湛江贵哥讲数学博客园 sketch template

如图在三棱锥P ABC中AC＝BC＝2∠ACB＝90°AP＝BP＝ABPC⊥AC． Ⅰ求证PC⊥AB Ⅱ求直线BC与平面 sketch template

如图在三棱锥P ABC中PA=PB=PC=AC=4AB=BC=2．1若点P在底面ABC内的射影是点O试指出点O的位置并说明理由 sketch template

如图所示侧面是全等的等腰三角形的棱锥是 A正棱锥 B侧棱长相等的棱锥C斜高长相等的棱锥 D以上均不对题目和参考答案——青夏教育精英 sketch template

如图在正三棱锥A BCD中EF分别是ABBC的中点EF⊥DE且BC=1 则正 三棱锥A BCD的体积是 A． B． C sketch template

如图所示三棱锥A BCD其中AB=CD=5AC=BD=6AD=BC=7则该三棱锥外接球的表面积为55π．题目和参考答案——青夏教育 sketch template

如图三棱锥P ABC的三条棱PCCACB两两互相垂直并且∠PAC=30PB=BC=3 �求二面角B PA C的大小 �设点C在 sketch template

在三棱锥P ABC中 PAC和 PBC是边长为2的等边三角形AB=2O是AB中点．1在棱PA上求一点M使得OM∥平面PBC2 sketch template

如图所示在四棱锥S ABCD中底面ABCD是正方形侧棱SD⊥平面ABCDSD=DC点E是SC的中点作EF⊥SB交SB于点F．1 sketch template

如图所示侧面是全等的等腰三角形的棱锥是 A正棱锥 B侧棱长相等的棱锥C斜高长相等的棱锥 D以上均不对题目和参考答案——青夏教育精英 sketch template

理在正三棱锥中分别是棱的中点且若侧棱则正三棱锥外接球的表面积是 A． B． C． D．文已知棱长为的正四面体右内切球 sketch template

已知三棱锥的三视图如右图所示其中侧视图为直角三角形俯视图为等腰直角三角形则此三棱锥的体积等于 A． B． C． D．题目和参考 sketch template

$三条侧棱两两垂直的正三棱锥其俯视图如图所示主视图的边界是底边长为2的等腰三角形则主视图的面积等于$frac{{sqrt{6}}}{3 sketch template$

17． 如图所示在四棱锥P ABCD中∠ABC＝∠ACD＝90°∠BAC＝∠CAD＝60°PA⊥平面ABCDE为PD的中点PA sketch template

如图所示在三棱锥P ABC中PA⊥平面ABC E为AC的中点 1求异面直线BE与PC所成角的余弦值 2求二面角P BE C sketch template

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