find the perimeter of a trianglewith sides 3i+4j+5k,4i-3j-5k and 7i+j?

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Solution

The perimeter, P, of a triangle is given by the formula
P = a + b + c
where a, b and c are the side lengths of the triangle.
Here P=(3i+4j+5k)+(4i-3j-5k)+(7i+j+0k)
=(14i+2j)
=2(7i+j)

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