Dau coroana! Urgent!

AB=CB=x
x²+x²=8²
x²+x=8
[tex]2x = \sqrt{8} \\ 2x = 2 \sqrt{2} \\ x = \sqrt{2} [/tex]
.
.
[tex]l = \sqrt{2} [/tex]
=>
Perimetru=
[tex] \sqrt{2} + \sqrt{2} + \sqrt{2} + \sqrt{2} = 4 \sqrt{2} [/tex]
=> Aria=
[tex] \sqrt{2 } {}^{2} = 2cm {}^{2} [/tex]