dau coroanaaaaaaaaa
![Dau Coroanaaaaaaaaa class=](https://ro-static.z-dn.net/files/da1/5cba930f8e76d19ce35922a2a403a88c.jpg)
pt ca triunghiul este isoscel si m(A)=120=>m(B)=m(C)= 30
triunghiul ABM=ANC Pt ca
AC=AB
BM=CN
m(B)=m(C)
triunghiulBMD=CNE Pt ca
BM=NC
m(B)=m(C)
mBDM=mNEC=90