Math Activities & News

Geometry - 2025 China Team Selection Test

A geometry question from the CTST in the previous year. A question that requires a bit of attention(注意力) and the knowledge of the Nine-point circle.

Finding average using integration

Trigonometry Integration

Calculus Question - Riemann Sum

Calculus Question (differentiating integrals)

Geometry - China Math Olympiad Mock Exam #3

A quite challenging geometry question that requires angle chasing skills and the use of similar triangles and the circle power theorem.

Geometry - China Math Olympiad Mock Exam #2

A geometry question that tests your ability of angle chasing.

Geometry - China Math Olympiad Mock Exam #1

A pretty plain geometry question.

Geometry - 2025 USA Math Olympiad

An easy geometry which requires the knowledge of fundamental theorems and the use of similar triangles.

Geometry - 2025 China National Math Olympiad Exam A

A very challenging geometry question from the national math olympiad in China in the previous year. My solution uses the method of coincidence and theorems such as the circle power theorem and the side form of Ceva's Theorem.