5. a)A=16cm²
l=√16cm⇒l=4
P=4cm·4⇒P=16cm
b)A=100m²
l=√100m⇒l=10m
P=10m·4⇒P=40m
c)A=9dam²
l=√9dam⇒l=3dam
P=3dam·4⇒P=12dam
6. a)60cm=3l⇒l=60cm:3⇒20cm
b)60cm=6l⇒l=60cm:6⇒l=10cm
a)96m=12L⇒L=96m:12⇒L=8m
P=2(8+12)⇒P=40m
b)96m=24L⇒L=96m:24⇒L=4
P=2(4+24)⇒P=56m
8. a) A = 2 * L + 2 * l
l = 12 * 5/6
l = 10 cm
A = 2 * 12 + 2 * 10
A = 44 cm²
b) L = 14 * 3/2 = 21 hm
A = 2 * 21 + 2 * 14
A = 70 hm
Sper ca te-am ajutat! :) :) :)