23 * 31 = 20 * 30 + 20 * 1 + 3 * 30 + 3 * 1 = 600 + 20 + 90 + 3 = 713.
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You multiply the length times the width using this formula:l x w=a (a=area)
easy
Area can be measured in square inches.
with base and height
further informations is needed to solve this problem. the area of a triangle is: .5bh plugging in 48 as the area and trying to solve would leave two unknowns.