The formula for the area of a trapezoid is a=1/2h (b+b) express b in terms a, h, and b2

The area of a trapezoid is

A = (1/2) (h) (b1 + b2).

('h' is the height of the trapezoid. 'b1' and 'b2' are its two bases.)

You want the equation solved for one base.

A = (1/2) (h) (b1 + b2).

Multiply each side by 2 : 2A = h (b1 + b2)

Divide each side by 'h' : 2A/h = b1 + b2

Subtract b1 from each side: 2A/h - b1 = b2