Search found 2 matches
- Mon Feb 13, 2017 7:28 pm
- Forum: National Math Olympiad (BdMO)
- Topic: National BDMO 2017 : Junior 8
- Replies: 8
- Views: 4973
Re: National BDMO 2017 : Junior 8
Don't kick yourself. You have 1 year more to be the COC or COO.
- Mon Feb 13, 2017 7:22 pm
- Forum: National Math Olympiad (BdMO)
- Topic: BdMO 2017 junior/9
- Replies: 2
- Views: 2668
Re: BdMO 2017 junior/9
geo.png At first we connect A, O. Then B, D. Then connect D, O and extend it beyond O which will intersect BC at point E. $\Delta{}$ABO is an isosceles, where AB = AO. So, $\angle{}ABO\ =\ \angle{}AOB.$ Now, $\angle{}ABO\ =\ \frac{180^\circ{}\ -\ \angle{}BAO}{2}=90^\circ{}-\frac{\angle{}BAO}{2}$ .....