The answer will depend on what kind of shape it is.
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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.
MOst of it
"18 perimeters" is is a meaningless phrase since there are no units of measurement. It is like asking how tall are 18 heights?
Because the area is different than the perimeters
they are different because perimeter is the out side of the shape and area is inside of the shape.