Let’s calculate the perimeter of a triangle as the sum of the lengths of all three of its sides (by definition of the perimeter).
P = 56 + 62 + 62 = 56 + 124 = 180 mm.
Let’s translate the found length of the perimeter from millimeters to centimeters.
180 mm = 18 cm.
Answer: The perimeter of the triangle is 180 mm or 18 cm.
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