英语翻译1.the number of diagonals(对角线) that can be drawn in a re

来源：学生作业帮编辑：作业帮分类：数学作业时间：2024/05/16 10:35:17

英语翻译
1.the number of diagonals(对角线) that can be drawn in a regular polygon with twenty sides(正12边形)is_______?
2.the areas of the faces of a rectangular box are 84 cm2(平方厘米啦)、70cm2 and 30cm2.The volume of the box in cm3 is_____

1,正12边形内最多可以画多少条对角线?
多边形对角线公式为：n（n-3）/2
12（12-3））/2=54
2.一个盒子的三个面的面积分别为84、70和30平法厘米,那么这个长方体的体积是多少?
可以设这个盒子的边长分别为：x、y、z,那么这三个面的面积可表示为
xy=84 yz=70 zx=30
三个式子相乘,得到（xyz）²=84*70*30,
所以长方体的体积为：V=xyz=420cm²
很简单啊,掌握方法和公式就可以了.

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