Anything larger than 4*sqrt(15) or 15.49 units.
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If an equilateral triangle and a square have equal perimeters, then the ratio of the area of the triangle to the area of the square is 1:3.
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The answer will depend on what kind of shape it is.
"18 perimeters" is is a meaningless phrase since there are no units of measurement. It is like asking how tall are 18 heights?