Advanced Geometric Problem & Solution (Twice a week update) Now 4681 problems posted.
<Tri-2025-2262>, hint
<BDN=ADM=<C and <MON=2<C, OM=ON.
Since <MDN=180-2<C <MON=2<C, OMDN are concyclic and <<ODM=<ODN.
<ODA=<ADM+<MDO(=<MNO)=90. Hence ODㅗAB
No comments:
Post a Comment