【填空题】【消耗次数:1】
已知四棱椎P-ABCD的底面是边长为6的正方形,侧棱PA垂直底面ABCD,且PA=8,则该四棱椎的体积是[填空1]
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相关题目
【判断题】 平面垂直于正棱柱底面截切,截交线为正方形
①  正确
②  错误
【单选题】 侧棱垂直于底面的棱柱为( )。
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②  直棱柱
③  正棱柱
④  不能确定
【单选题】 侧棱垂直于底面的棱柱为( )。
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②  斜棱柱
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【单选题】 正四棱锥底面边长是2,高是1,则斜高是()
①  <img class="kfformula" src="20190809/1565327137897917.png" data-latex="\sqrt {2}"/>
②  <img class="kfformula" src="20190809/1565327137411071.png" data-latex="\sqrt {5}"/>
③  <img class="kfformula" src="20190809/1565327137707931.png" data-latex="2"/>
④  <img class="kfformula" src="20190809/1565327137840495.png" data-latex="\sqrt {3}"/>
【单选题】 丈量一正方形的4条边长,其观测中误差均为±2cm,则该正方形周长的中误差为±( )m
①  0.5
②  2
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【单选题】 丈量一正方形的4条边长,其观测中误差均为±2cm,则该正方形周长的中误差为±( )cm。
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①  <img class="kfformula" src="20190809/1565327194325168.png" data-latex="60"/>
②  <img class="kfformula" src="20190809/1565327194151271.png" data-latex="48\sqrt {3}"/>
③  <img class="kfformula" src="20190809/1565327194214174.png" data-latex="24"/>
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