[tex] {bc}^{2} = {ab}^{2} + {ac}^{2} [/tex]
[tex] {4}^{2} = {ab}^{2} + {3}^{2 } [/tex]
[tex]ab {}^{2} = {4}^{2} - {3}^{2} [/tex]
[tex]ab ^{2} = 16 + 9[/tex]
[tex] {ab}^{2} = 25[/tex]
[tex]ab = 5[/tex]
a. ABDE=patrat=>A=5•5
A=25cm pătrați
b. ABDE=patrat=>BD=AB=5cm
