Răspuns :
A□=81 m2
___________
l□=? m
P□=? m
A□=l×l, unde l=latura
=>l×l=81 m2 <=>l=9 m
P□=4×l, unde l=latura
P□=4×l; l=9 m=>P□=4×9 m=36 m
A□=81 m2
___________
l□=? m
P□=? m
A□=l×l, unde l=latura
=>l×l=81 m2 <=>l=9 m
P□=4×l, unde l=latura
P□=4×l; l=9 m=>P□=4×9 m=36 m