Răspuns :
P=512 cm
L=3l
P=2(L+l)=>2l+2L=>
=>2xl+2x3l=2l+6l=8l
=>8l=512
=>l=512:8=>l=64cm
L=3x64=192 cm
L=3l
P=2(L+l)=>2l+2L=>
=>2xl+2x3l=2l+6l=8l
=>8l=512
=>l=512:8=>l=64cm
L=3x64=192 cm