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The similarity ratio is 1:4.
If the ratio of similarity is 310, then the ratio of their area is 96100.
Measure any two corresponding edges. The ratio of these edges is the similarity ratio.
You need to find the perimeter of one by adding together the lengths of all its sides. The perimeter of the similar shape is the answer multiplied by the similarity ratio.
Yes, congruence is a stronger condition than similarity.