An equilateral triangle is shown with one side labeled 12 in.
The perimeter of this equilateral triangle is
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36 inches.
Since an equilateral triangle has three sides of equal length, if one of the sides is 12 inches, then the other two sides are also 12 inches. To find the perimeter, we need to add the length of all three sides:
Perimeter = 12 inches + 12 inches + 12 inches
Perimeter = 36 inches