Calculus and vectors

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A parallelogram is formed by R^3 by the vectors PA=(3,2,-3) and PB=(4,1,5). The point P=(0,2,3).

a) what are the location of the vertices?

b) what are the vectors representing the diagonals?

c) what are the length of the diagonals?

  • Calculus and vectors -

    (a)
    Parallelogram: PACB, where
    P(0,2,3) is a vertex.
    A=P+PA=(0,2,3)+(3,2,-3)=A(3,4,0)
    B=P+PB=(0,2,3)+(4,1,5)=B(4,3,8)
    C=A+PB=(3,4,0)+(4,1,5)=C(7,5,5)
    (b)
    PC=C-P=(7,5,5)-(0,2,3)=(7,3,2)
    AB=B-A=(4,3,8)-(3,4,0)=(1,-1,8)

    Lengths
    PC=sqrt(7²+3²+2²)=sqrt(49+9+4)=√62
    I leave you to find the length of AB in a similar way to finding length of PC.

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