Daca nu sunt paralele bisectoarele inseamna ca coincid si atunci paralelogramul devine romb
Deci laturile sunt toate egale=4cm
Fie AC∩BD={O)
AC⊥BD (diagonalele rombului)
∡A=60°⇒ ΔABD echilateral⇒ BD=4cm
AO inaltime in tr echilateral⇒
[tex]AO=\frac{l\sqrt{3} }{2} =2\sqrt{3} \\\\AC=4\sqrt{3} (diagonala\ mare)\\\\\\A_{ABCD}=\frac{d_1\times d_2}{2} =\frac{4\times 4\sqrt{3} }{2} =8\sqrt{3} cm^2[/tex]
