A polygon must be a plane, closed figure bounded by straight lines.
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A polygon with 3 sides is a triangle.
A triangle is a 3 sided polygon.
A 3 sided polygon is the shape of a triangle.
When a polygon is dilated by a scale factor of 3, all its sides are multiplied by 3. This means the perimeter of the image polygon is 3 times the perimeter of the original polygon. Therefore, the ratio of the perimeters is 1:3, as stated. This ratio holds true for any polygon being dilated by the same scale factor.
A polygon has 3 or more joined side