The perimeter is the sum of the lengths of all the sides of a figure. If there are only two sides, it is their sum. In this case it would be 16 inches.
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Perimeter = 4*12 = 48 inches
Area = 12 sq inches so each side is sqrt(12) inches So perimeter = 4*side = 4*sqrt(12) = 13.86 inches (to 2 dp).
Perimeter = distance around all 4 sides = 12 + 5 + 12 + 5 = 34 inches.
The perimeter of an equilateral triangle with a side length of 4 inches is 12 inches. Each side of an equilateral triangle is equal in length, so the perimeter is found by multiplying the side length (4 inches) by 3.
It is: 4*12 = 48 inches