Adding the lengths of the straight sides of any polygon will give its perimeter.
In the case of regular polygons it will be the length of the side multiplied by the number of sides.
But in the case of a non-regular polygon all the individual sides' lengths will be added to give you the perimeter.
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By adding together the 3 line segments.
That would be "perimeter". The perimeter is the distance around a figure, and it is calculated by adding the lengths of the different sides. For example, for a triangle, add the lengths of the three sides.
perimeter is adding the lengths of the sides together
The perimeter of anything is found by adding all of the sides. So in the case of a pentagon it is the sum of the length of its five sides.
You find perimeter by adding all the sides of a figure.