Question

Calculati aria unui patrat cu latura de lungine :
a)3cm

Answer 1

$A=l^2 \\ l=3 \ cm \\ A=3^2 \\ \boxed{A=9 \ cm^2}.$

Answer 2

$A= a^{2} \\ a=3 cm \\ A= (3cm)^{2} = 9 cm^{2}$