1. P= 2L + 2l = 2radical 80 + 4radical45 = (se descompune 80 si 45) = 2 ori 4radical5 + 3radical5 = 8radical5 + 3radical5 = 11radical5
2. aria = l ori L
36 = 3radical3 ori L
L = 36 : 3radical3(SCRIE SUB FORMA DE FRACTIE)
L = 12 : RADICAL3 (RATIONALIZEZI)
L = 12RADICAL3 : 3
L = 4RADICAL3