Search
Google ClassroomGoogle Classroom
GeoGebraGeoGebra Classroom
GeoGebra
  • Home
  • Resources
  • Profile
  • Classroom
  • App Downloads

The Cosine Formula - Proof Without Words

Author:Anthony OR 柯志明
Topic:Cosine

New Resources

  • Exploring GeoGebra for the First Time
  • Volume by Disk/Washer around y
  • Prism Drawn in 1-Point Perspective
  • Reflection Across 2 Parallel Lines
  • Pitfalls of Disk/Washer Method

Discover Resources

  • BrushStroke
  • Segment Bisector
  • Willaman Vertical Angle
  • tacos
  • Desargues' theorem in 3D

Discover Topics

  • Pie Chart or Circle Chart
  • Hypergeometric Distribution
  • Tangent Line or Tangent
  • Terms
  • Optimization Problems
AboutPartnersHelp Center
Terms of ServicePrivacyLicense
Graphing CalculatorCalculator SuiteMath Resources

Download our apps here:

Download_on_the_App_Store_Badge_US-UK_RGB_blk_4SVG_092917

© 2026 GeoGebra®