体对角线是连接棱柱上下底面的不在同一侧面的两顶点的连线。
用矢量点积求立方体的两条对角线所夹的钝角。
Use the vector dot product to find the obtuse Angle between two diagonals of a cube.
用矢量点积求立方体的两条对角线所夹的钝角。
Use the vector dot product to find the obtuse angle between two diagonals of a cube .
它可用于测试金属的维氏或努氏硬度，通过把测量的对角线值输入到一体化计算器，从而计算出硬度值。
It can be used to test the metal Vicker's or Knoop's hardness, through the diagonal measurement of the value of integration into the calculator, thereby calculate the hardness value.
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