[tex]Ipoteza:~romb
~~~~~~~~~~~~~d_{1}~=~18~cm
~~~~~~~~~~~~~d_{2}~=~20~cm
Concluzie: ~A_{romb}~=~?
Demonstratie: ~A_{romb}~=\dfrac{{d_{1}~*~d_{2}}}{2}~==\ \textgreater \
~
A_{romb}~=~\dfrac{18~*~20}{2}~==\ \textgreater \
~
A_{romb}~=~\dfrac{360}{2}~==\ \textgreater \
~
\boxed{A_{romb}~=~180~cm^2}}[/tex]
