It means it measures 87 units across.
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Honey, measuring the width of a triangle is as easy as measuring the distance between two of its sides. Just whip out your ruler or measuring tape, line it up perpendicular to the base, and boom, you've got your width. No need for fancy math or geometry tricks here, just good old-fashioned measuring.
It depends on what you are measuring the width of. Different units and different tools would be appropriate for a hair, a car or a galaxy.
millimetres (or tenths of millimetres, if you have a micrometer)
The square footage of a lot measuring 81x180x113x180 is 20,340 square feet. Square footage is found by multiplying the length by the width of an area.
L + W = 87. L = 2W + 9 so (2W + 9) + W = 87 ie 3W = 78 so Width is 26 m and Length is 61 m.