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put this solution on YOUR website!Please can I aiutere because I did not understand this problem:
a dimension of a rectangle is three times the 'other and their sum is 120 cm.
L = 3W
L + W = 120 cm
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3W + W = 120
W = 30 cm
L = 90 cm
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calculates the perimeter of an equilateral triangle whose side is congruent to twice the minor dimension of the rectangle.
s = 30 cm
P = 3s = 90 cm