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OpenStudy (anonymous):
Three sides of a quadrilateral measure 2.5 centimeters, 1.8 centimeters, and 9 centimeters. If the perimeter of the quadrilateral is 20.9 centimeters, what is the length of the fourth side?
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OpenStudy (anonymous):
7.6 centimeters! Just add them together, and subtract them from the total!
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