INTRODUCING 5 - days-a-week problem solving session for Math Olympiad and ISI Entrance. Learn More 

Learn with Cheenta

About 500 advanced videos on beautiful mathematics. Free for the world. 

You may use these to learn new concepts. More videos are added every week.


Locus Problems - Application
Geodesics on a Sphere
Triangles on a Sphere
Triangular Inequality - Introduction
Construction of a Geometric Mean
Geometry of AM GM Inequality
Area Problems
Carpet Strategy
Maximising Area
Inradius × semi peri meter=Area; application
Lines, Angles and Triangles
Angles opposite to largest side: application
Angle Bisector Theorem: Application
Extended Pythagoras Theorem: Application 1
Extended Pythagoras Theorem: Application 2
Ceva's Theorem
Menelaus' Theorem - Concept
Menelaus' Theorem - Application
Geometry of Circles
Opposite angles of a cyclic quadrilateral adds up to 180 degree: Application in RMO 2008 Problem 1
Cyclic Quadrilaterals, Napoleon Triangles: Part 1
Cyclic Quadrilaterals, Napoleon Triangles: Part 2
Cyclic Quadrilaterals, Napoleon Triangles: Part 3
Inradius, Exradius - Concept
Inradius and concyclic points - Application in RMO
Orthocenter and Circles: Part 1
Orthocenter and Circles: Part 2
Orthocenter and Circles: Part 3
Orthocenter and Circles: Part 4
Power of a point
Sine rule and incenter
Nine Point Circle: Part 1
Nine Point Circle: Part 2
Nine Point Circle: Part 3
Euler formula: $𝑑^2=𝑅^2–2𝑅 times 𝑟 $
Circles in Circle: PRMO 2017 problem
Geometric Transformation
Translation – Concept and Application
Reflection – Concept and Application
Rotation – Application in Fermat Point Problem
Inversion concept
Inversion: Application Part 1
Inversion: Application Part 2
Complex Numbers in Geometry
Complex numbers and Geometry
Triangles in Complex Plane
Mass Point Geometry
Mass Point Geometry Part 1
Mass Point Geometry Part 2


Basic Counting Principle
Multiplication and Addition Principle
Bijection Principle
Invariance Principle
Extremal Principle

Number Theory

Modular Arithmetic
Advanced Topics



Cheenta. Passion for Mathematics

Advanced Mathematical Science. Taught by olympians, researchers and true masters of the subject.