Usually.
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It means it measures 87 units across.
Height - is the distance from the ground to the top of an object... width is the distance across the widest part... and depth is the measurement from front to back.
Straight across it's 250m but going along the curves it's 290m.
Draw a rectangle and shade it in, across its whole width and along two thirds of its length.
u times the length by the width. ( that means times the line going across buy the line going down)