For a trapezoid, the following formula relates the area a, the two bases a and b, and the height h. a= g (a
b./2 solve for b
a. b= ah/2-a
b. b= 2a-a/h
c. b= 2a/h a
d. b= 2a/h-a

A - area of a trapezoid;
a, b - two bases.
A = h * ( a + b ) / 2            / * 2  ( we have to multiply both sides by 2 )
2 A = h *( a + b )
2 A = h a + h b
h b = 2 A - h a
b = ( 2 A - h a ) / h
b = 2 A/h - a
D )

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