Let the three consecutive whole numbers be x, x+1, and x+2.
The perimeter of the triangle is the sum of the lengths of the three sides:
x + (x+1) + (x+2) = 42
3x + 3 = 42
3x = 39
x = 13
Therefore, the three sides of the triangle are 13 cm, 14 cm, and 15 cm.
The sides of a triangle are three consecutive whole numbers. The perimeter of the triangle is 42 cm. How long is each side?
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