BD=1,8+2BD/3
BD=5,4 dm,
BE=3,6 dm
AD=√(DE x BD)=√(1,8 x 5,4)=9√3/5 dm
AB=√(BE x BD)=√(3,6 x 5,4)=9√6/5 dm
aria dreptunghiului, A=AB x AD=243√2/25 dm2
