The best way to learn geometry interactively

Interactive problem solving that's effective and fun. Get hands-on with angle axioms, perimeter and area calculation strategies, coordinate geometry, 3D geometry, and more.

Get started

Join over 10 million people learning on Brilliant

App of the day award Best-app award

Courses covered

Geometry

Geometry

  • Angle Axioms
  • Measuring Areas
  • Parallel and Perpendicular Lines
  • Perimeter
  • Similarity
  • Surface Area
  • The Pythagorean Theorem
  • Three-Dimensional Figures
  • Volume
Geometric Thinking

Geometric Thinking

  • Angle Axioms
  • Angle Hunting Shortcuts
  • Composite Area
  • Complementary Areas
  • Curry's Paradox
  • Invariant Areas
  • Polygon Angles
  • Regular Polygons
  • Stellations
  • The Triangle Inequality
  • Triangle Congruence
  • Triangle Similarity
  • Centroid
  • Circumcenter
  • Cyclic Quadrilateral Theorem
  • Euler's Line
  • Incenter
  • Inscribed Angles
  • Intersecting Chord Theorem
  • Intersecting Secants Theorem
  • Intersecting Tangent Theorem
  • Orthocenter
  • Power of a Point Theorem

Over 50,000 5-star reviews on iOS App Store and Google Play

See math and science in a new way

All of our courses are crafted by award-winning teachers, researchers, and professionals from MIT, Caltech, Duke, Microsoft, Google, and more.

  • Foundational Math
  • Software Development
  • Science
  • Foundational Logic
  • Data Science
  • High School Math
  • Engineering
  • Statistics and Finance

Courses in Foundational Math

  • Solving Equations
  • Geometry
  • Mathematical Thinking
  • Geometric Thinking

Join over 10 million people learning on Brilliant