Skip to content / Đến nội dung
ThichHocToan.com

MathNet 2008-part-03 — 165 problems (EN–VI) Question 21

Math Olympiad Vault · MathNet 2008-part-03 — 165 problems (EN–VI)

Question 21

Calculate the angles in the triangle $ABC$, if the angle between the altitude from $C$ and the bisector of the angle $ACB$ is $9^\circ$, and the angle between the bisectors of the exterior angles at the vertices $A$ and $B$ is $61^\circ$.