Respuesta :
A=1/2(a+b)h ↔ A= [(a+b).h]/2
Cross multiplication:→2A = (a+b).h.
Divide both sides by (a+b):
2A/(a+b) =h
Cross multiplication:→2A = (a+b).h.
Divide both sides by (a+b):
2A/(a+b) =h