The formula for the area of a triangle is a = 1 2 bh, in which b represents the length of the base and h represents the height. if a triangle has an area of 138 mm2 and the height is 12 mm, what is the measure of the base?

Area of a triangle = (1/2)(base)(height).

Here,  2(area of triangle) = (base)(height), so base  = 2(area of triangle) / height.

For this particular triangle, the base is 2(138 mm^2) / (12 mm), or base = 23 mm

he earned 78.75 in interest.

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