solve for b2.

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

3 answers

That is just the formula for area of a trapezoid. What is the problem?
solve for b2. so move it around until it is b2=...
Oh

2 A = h b1 + h b2
h b2 = 2 A -h b1
b2 = (2 A - h b1)/h