Răspuns :

Ctinamaria31xxxid
L=15+l
P=78
l+l+L+L=78
2l+2L=78 /:2
l+L=39
l+15+l=39
2l=39-15
2l=24
l=24:2
l=12

L=15+12
L=27
Marayke30id

 l   /_____/

l    /_____/                                                                  } 78 cm

L   /_____/15/

L   /_____/15/

78 cm - ( 15 cm + 15 cm ) = 78 cm -30 cm = 48 cm  ( 1p + 1 p + 1 p + 1 p = 4 parti egale)

 Cat reprezinta o parte ?

48 cm : 4 = 12 ( o parte ) -  latimea

12 cm + 15 cm = 27 cm (  lungimea )