Conventionally length is the longer dimension.
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length is up and down width is side to side
perimeter = length + length + width + width = 2*length + 2*width = 36 length = 5*width 2*(5*width) + 2*width = 36 12*width = 36 width = 3 length = 15
A rectangle has only two dimensions, for example, length and width. The longest side is usually called the length, the other side, the width.
The depth is neither the length nor width. Length is the measurement from top to bottom, width is from side to side, and depth is from front to back.
1500/30 = 50 cm in length