Question

(ABCD)patrat
AB=10 CM
AC=? DIAGONALA
Apatrat=?
Ppatrat=?

Answer 1

AC=ABrad2=10rad 2 cm
A=AB^2=100cm^2
P=4AB=40cm

Answer 2

diagonala patratului = L$\sqrt{2}$
AC = 10$\sqrt{2}$ cm 

A = L^2 = 10^2 = 100 cm^2 
P = L x 4 = 10 x 4 = 40 cm