Respuesta :

Answer:

b1 = (2A/h) - b

Step-by-step explanation:

Follow these steps to solve:

A= h ( b1 + b2 ) / 2

2A = h (b1 + b2)

2A/h = b1 + b2

(2A/h) - b2 = b1

b1 = (2A/h) - b2