问题标题：
sat2数学求解aplanecutsthroughacubeinsuchawaythattheplanepassesthroughthreeofthecube'svertices,notwoofwhichlieonthesameedge.iftheedgeofthecubehasalengthof1,whatisthesurfaceareaofthesmallerfragmentof
问题描述：
sat2数学求解
aplanecutsthroughacubeinsuchawaythattheplanepassesthroughthreeofthecube'svertices,notwoofwhichlieonthesameedge.iftheedgeofthecubehasalengthof1,whatisthesurfaceareaofthesmallerfragmentofthecube?
a,2.4
b2.7
c3.1
d3.7
e4.3
求过程
曹兆勇回答：
很明显三个顶点不共面则切面是正三角形,
较小的部分是一个四面体,三个面为等腰直角三角形,面积为1/2,
另一个面试正三角形,边长√2,面积√3/2
总面积3*1/2+√3/2=2.366
选A
点击显示
数学推荐
热门数学推荐