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Area is 584.24cm² Perimeter is 88cm
54 inches
The height of a triangle alone is not enough information to find the perimeter. You need some angle measures or side lengths.
Perimeter is total edge length. A stop sign has 8 sides, so 8"*12=96"■
The perimeter of the larger polygon will have the same ratio to the perimeter of the smaller as the ratio of the corresponding sides. Therefore, the larger polygon will have a perimeter of 30(15/12) = 37.5, or 38 to the justified number of significant digits stated.