Răspunsuri

2014-10-15T11:31:27+03:00
[BD=bis(ABCD=romb)⇒m(ABD)=m(DBC)=x ,m(BCD)=2m(CBD)⇒m(BCD)=2x
AB//CD⇒M(DCB)+M(ABC)=180⇒2x+2x=180⇒4x=180⇒x=45⇒m(DCB)=90
ABCD=romb ⇒ABCD=paralelogram ⇒ABCD=patrat