Respuesta :

P = 2(L + H)
L = H + 3 <=== this is ur length

P = 2(H + 3 + H)
P = 2(2H + 3)
P = 4H + 6 <== this is ur perimeter

A = L * H
A = H(H + 3)
A = H^2 + 3H <== this is ur area