By convention the longer side is called the length, but it doesn't have to be.
Consider a rectangular window:
If you were to buy a blind for a window, the length of the blind would correspond to the drop from top to bottom of the window, and the width of the blind would correspond to the distance from side to side. If the window was a short, wide window the width of the blind would be longer than its length!
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on the left and right is the lengh, and on the top and bottom is the widthThat previous answer (above) makes no sense whatsoever.A short dictionary definition for length is "the longest dimension of something that is fixed in space". Therefore, with a 2-dimensional rectangle, when the sides are not labeled, and no other instructions are given, the LENGTH of the figure is ALWAYS going to be the LONGEST side, while the width is the shorter side. But some people incorrectly assume the LENGTH of a rectangle is always going to be the HORIZONTAL side. This is because most of the time, when a 2-dimensional rectangle is presented on paper, the length is nearly always placed on the horizontal anyway. So, unless all the terms are clearly defined or otherwise noted, ALWAYS assume the LONGEST side is the length.
A rectangle with a perimeter of 48 and 1 side equal to 5 would have its other sides lengths of 5, 19, 19. Such a rectangle would have an area of 95 sq/m. Your question is somewhat strange, as the "length" of a rectangle generally refers to the longer side - in this case the length would be 19 and the width 5.
the side of this rectangle are marked off in centimeters.if the rectangle is enlarged proportionally so that the longer side is 45 cm how long will the shorter side be ?
length
Length of a long side x length of a short side = area