正四面体是正三棱锥,有四个等边三角形组成,表面积4根号3,则每个等边三角形面积为根号3,则等边三角形边长为2,其顶点到底面高为3/2
体积为1/3(3/2*根号3)=根号3/2
猜你喜欢
- 1有两筐苹果,共重35千克,从第一筐中拿出二分之一千克放入第二筐.
- 2下列历史事件与汉武帝有关的是：
- 3生活中有哪些液化现象?原理是什么?
- 4What are you going to ________about the picnic next week A. talk B. tell C. say D.speak
- 5what do you do every
- 6We will be very careful and keep what you have told us strictly _ A privateB rigorousC mysterious
- 7小学四年级数学题,帮忙解答
- 8形容容易的成语（要带有手字的）.
- 9解方程组：5x−4y+4z＝132x+7y−3z＝193x+2y−z＝18．
- 103月3号用英语怎么说