Math Is Fun Forum

kgh

Member

Registered: 2009-02-08

Posts: 11

Find perimeter using vectors

A rectangle has sides represented by vectors A (2,3) and B (-6,4). Determine the perimeter of the rectangle.

Do I find the answer by calculating the magnitude of OA and OB?

Thanks!

luca-deltodesco

Member

Registered: 2006-05-05

Posts: 1,470

Re: Find perimeter using vectors

i'd argue against your terminology 'calculating magnitude of OA and OB' as OA and OB refer to the vector between two points A, B and the origin, whereas A and B given are already vectors, and thus OA and OB don't make any sense.

But yes, you are correct; you would find the perimeter by calculating the magnitude of A and B, this is the length of the two sides, and thus the perimeter would be 2(|A| + |B|)

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