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The formula for the perimeter of a rectangle is P=2(l+w).

Solve For W.

The formula for a trapezoid relates the area A, the two bases, a and b, and the height, h
A=(a+b)2h

Solve for a

Answer :

P=2(l+w)
P/2=l+w
W=p/2-l

A=(a+b)2h
A/2h=a+b
a=A/2h-b

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