The area of a trapezoid is 9 cm². The height is 3.6 cm and the longer parallel side is 2.8 cm. Determine the length of the shorter parallel side.

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Area=h(b1+b2)/2, where b1 and b2 are the lengths of the parallels, and h is the height.

9=3.6(2.8+b2)/2, 18/3.6=2.8+b2, 5-2.8=b2, b2=2.2cm.
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