Measure each side and add them up to get the sum of the side-lengths = perimeter.
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1+1+1
To find the sum of something means to add. Example: 9X3=27 The sum of 9x3 is 27.
"sum" means addition.... +
Interior angles of any polygon: (N-2)*180 = sum of interior angles when N is the number of sides
No, it could be a partial sum.