2)a)L=4cm
l=4:2=2cm
( L)
_ _ _ _
| | ( l )
|_ _ _ _|
B) l=2cm
L=2x3=6cm
(L)
_ _ _ _ _ _
| | (l)
|_ _ _ _ _ _|
P=2x(L+l)
P=2x(4+2)=2x6=12 cm
P=2x(6+2)=2x8=16 cm
5)stim ca patratul are toate laturile egale,aflam câti cm are o latura
l1+l2+l3=18
3l=18
l=18:3
l=6cm
P=4xl
P=4x6=24 cm
