High-scoring problems typically involving circles, tangents, and coordinate geometry (e.g., finding parameters for concurrent lines).
Common problems identified in recent Yên Phong HSG papers include: Find all positive integers is divisible by Concurrent Lines: Finding so that three lines, such as , intersect at a single point. Circle Geometry: Proving geometric relationships such as using properties of tangents and chords. Resources for Preparation Дђб»Ѓ thi HSG ToГЎn 9 huyện YГЄn Phong
VnDoc : Offers downloadable versions of past papers specifically for Yên Phong district. High-scoring problems typically involving circles