Respuesta :
P = 2(l + w)
P/2 = 2/2(l + w)
P/2 = l + w
P/2 - l = l - l + w
p/2 - l = w
w = p/2 - l
P/2 = 2/2(l + w)
P/2 = l + w
P/2 - l = l - l + w
p/2 - l = w
w = p/2 - l