it goes up and down not across
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Length is across
u times the length by the width. ( that means times the line going across buy the line going down)
THEY GO ACROSS NOT UP AND DOWN. THAT IS FOR COLUMNS.
Most books have rectangles for their front covers, so Area = length x width. Measure the width across the top edge of the front cover, then the length down the spine edge of the front cover (the left side of the front for most books produced in the Americas and Europe). Multiply the length by the width and you will have the area of the front cover.
Diameter. distasnce from center to edge is radius length around is circumfrance