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Volume Parallelepiped, Area of a Triangle Constructed by two vectors in R3
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What is the formula to find the area of a parallelogram constructed by two vectors
the length of the cross product of two vectors

What is the formula to find the length of a triangle constructed by two vectors
one half times the length of the cross product of two vectors
How do you find the area of a triangle constructed by three points?
use the points to find the directed line segments that become your two vectors

What is the formula to find the volume parallelepiped?
the absolute value of the dot product of W with the cross product of U and V