2 .a perimterul = 6*2cm + 4*2cm= 20 cm
b aria = 6cm*4cm= 24cm patrati
3 . 2L+2l=40cm
L= 3l ==>6l+2l=40==> 8l=40==>l=5cm==L=3*5=15 cm
rezulta ca aria este 5*15=75 cm patrati
4.volumul paralelipipedului=2*4*8=64dm cubi
volumul cutiilor= 20 la puterea a treia = 8000cm cubi =8 dm cubi
64:8=8 cutii incap in paralelipiped
5. V=100cm cubi
100cm cubi=5*2*x
10cm cubi=x
h=inaltimea=x
