Posted by **kimama** on Sunday, November 8, 2009 at 10:55pm.

A trapezoid has a lower base which is twice as long as its parallel upper base. The upper base is 21 cm long. One non-parallel side is 20 cm long and the other non-parallel side is 6 cm longer than the shorter non-parallel side. What is the perimeter of the trapezoid?

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