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SUROJ
 3 years ago
when to use cross and when to use dot product of vector?
SUROJ
 3 years ago
when to use cross and when to use dot product of vector?

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Quel
 3 years ago
Best ResponseYou've already chosen the best response.0Depends on what you want to exercise. dot product between vectors v and w ... it provides the angle between the vectors. v.w =  v .  w . cos (a) It is very useful when the vectors are orthogonal ... because the scalar product = 0 v.w cross product between vectors v and w ... it provides the area of the parallelogram = 2. (area of the triangle) cross product between vectors u, v and w ... providing the volume of the parallelepiped = 6. (volume of the tetrahedron) the vector product is useful for calculating areas and volumes. (I do not know if I understand your question. = /)

brinethery
 3 years ago
Best ResponseYou've already chosen the best response.0Do you have an example?

brinethery
 3 years ago
Best ResponseYou've already chosen the best response.0Cross product: If you have two vectors in 3space (or nspace), then if you cross those vectors you'll get a vector that is perpendicular. If you have two vectors in 2space, you'll know if the orthogonal vector goes "in" to the page or sticks "out" of the page depending on which vector your right index finger hits. Dot product: If you want to find the "projection" of a onto b, then you dot vector a with the unit vector b. You'll get a measurement from the tip of a down to b which forms a rightangle at b.
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