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OpenStudy (anonymous):
Help! 3. A trapezoid has an area of 166.5 in.², a height of 9 in., and one base measuring 15 in. What is the length of the other base? (1 point) 3.5 in. 7 in. 18.5 in. 22 in.
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Directrix (directrix):
The area of a trapezoid is found by taking (1/2) of its height and multiplying the result by the sum of the two bases of the trapezoid.
Directrix (directrix):
In this case, 166.5 = (1/2) * 9 (15 + b) where b is the unknown base. 333 = 9* (15 + b) Divide both sides of the equation by 9 and solve for b.
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