If the figure is a polygon ... with sides made of straight line segments ... then the
perimeter is the sum of the lengths of all the sides.
If part or all of the figure's boundary consists of curves, the perimeter is still the distance
all around the figure, but you may need special formulas to find the lengths of the curved
sections.
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You find perimeter by adding all the sides of a figure.
When the linear dimensions of a plane figure are quadrupled, its perimeter is quadrupled, and its area is multiplied by 42 = 16 .
To find the perimeter of a figure, add up the lengths of all of its sides.
the area and perimeter of the plane figures are square ,rectangle
If the figure is 2-dimensional, it is called the perimeter.