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2015-02-21T09:41:52+08:00

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Actually, people made formulas for polygons, but in another way, the definition of the perimeter is the sum of the lengths of all sides. Example:

Rectangle:
It has length and width right? so you can write it as:
P=L+L+W+W
or simply
P=2L+2W
or if you factor it out;
P=2(L+W)

Square:
It has all sides equal right?
P=s+s+s+s
P=4s

Triangle:
sometimes it doesn't have equal sides
P=a+b+c
but if it is equal
P=3s

Hope this helps =)
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2015-02-21T15:13:37+08:00

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The formula is you're just going to add the length of each side.
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