I am not sure about these things about vector:(adsbygoogle = window.adsbygoogle || []).push({});

- Is it true to say that a vector n orthogonal to vector n1 and n2 is the cross product of n1 and n2 ?

- Is it true to say that if a line is parallel to a plane, the normal vector of the plane is orthogonal to the parallel vector of the line ?

- Is the acute angle between two planes the angle created by two normal vectors of those planes ?

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# Some vector concepts

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