The length is 340 cm, and the width is one-half of the length, which is equal to the perimeter of the rectangle.

1. The perimeter of the rectangle is found by the formula P = 2 * (a + b), where P is the perimeter, a and b are the length and width of the rectangle, respectively. Find the width if it is known to be half the length:
340/2 = 170 cm.
2. Find the perimeter, knowing the length and width of the rectangle:
P = 2 * (340 + 170) = 2 * 510 = 1020 cm.
Answer: the perimeter of the rectangle is 1020 cm.



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