1. L = 12 m si l = 8 m ;
A dreptunghi = 2( L + l ) => A = 40 m^2 ;
x = m a = ( 12 + 8 ) / 2 = 10 m ;
A patrat = x^2 = 100 m^2 ;
40 < 100 <=> A dreptunghi < A patrat ;
2. A = 144 => l = 12 cm ;
P = 4l => P = 48 cm ;
3. L = 204 /12 = 17 cm ;
P = 2 × 29 = 58 cm ;