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For a trapezoid, the following formula relates the area A, the two bases a and b, and the height h.

A=(a+b)2h

Solve for a.

Aa=2A−bh
Ba=2Ah+b
Ca=2Ah−b
Da=Ah2−b

Verified Answer :

I hope this helps you


A=(a+b).h/2


2A=(a+b).h


2A/h=a+b


a=2A/h-b


a=2A-b.h/h

I think you mistyped a little, the Area of the trapezoid is (a + b) h / 2, and then you can find the right solution, which is 2A / h - b = a, but I cannot see this option either. You may mistyped the solutions as well.

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