Conventionally it often is but it depends on the context. For a doorway you usually have a height and a width but no length.
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Shortest side -------------------- Longest side
True. In any triangle, the longest side is always opposite the largest angle; the shortest side is always opposite the shortest angle; and the middle length side is always opposite the middle size angle. In an isosceles triangle, there is no middle length side; and the two sides of equal length are opposite the angles of equal size. In an equilateral triangle, all sides are the same length, as are all the angles.
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.
9 in.
The longest side of a triangle is opposite to its largest angle