The perimeter is the length plus width times 2.
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The length around a flat figure or the sum of its sides.
area is the outside of the shape, to get it, add all sides together. perimeter is the diagnal. i learnt that in 7th grade maths. :)
It depends on what you are summing together: the lengths of the sides - to find the perimeter - or the exterior or interior angles - to satisfy a maths question.
Hi i was a maths major in Oxford and the triangle is called WhoGivesAratsAss triangle.