perimeter is the sum of all sides.
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The perimeter is doubled.
-- Measure or figure out the length of each side. -- Add up all the lengths of all the sides. -- The answer is the perimeter of the shape.
Perimeter of a figure means the sum of the lengths of all the sides.A square has four sides, and in this case, the square's sides' lengths are 21 in.21 in. * 4 sides = 84 in.
The perimeter.
a + b + c + d