If the sides of two shapes have a scale factor of sf:1, then their areas will be in the ratio of sf2: 1.
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Perimeter will scale by the same factor. Area of the new figure, however is the original figures area multiplied by the scale factor squared. .
For areas: Square the Scale Factor.
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The areas are related by the square of the scale factor.
New perimeter = old perimeter*scale factor New area = Old area*scale factor2