right hand rule：右手四指先沿着第一个矢量a，向第二个矢量弯曲，大拇指的方向就是cross product的方向
这是说 cross product （即叉乘，或向量积） axb 还是向量，它的方向依 right hand rule（右手准则）确定，即用右手的中指、食指和拇指分别表示a，b 和 axb，它们作成一个正交标架。
Learn about the cross product & the right-hand rule in vector multiplication. See how to calculate the magnitude of the cross product & examples of...
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用右手从a的方向握向b的方向，那么大拇指所指的方向即为叉积的方向，你可以想象一下直角坐标系的x、y、z轴，从x握向y，大拇指方向为z，图解参考下图
c=axb,c垂直于a,b确定的平面。右手系： 右手握拳竖起大拇指， 右手四个手指是从 a 到 b 的旋转方向（旋转角度最小<=180度），大拇指方向则为 c 的方向。
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