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

Double Angle Trig Identity: Proof via Equal Areas

Author:Tim Brzezinski
Topic:Area, Cosine, Geometry, Sine, Trigonometric Functions, Trigonometry

New Resources

  • Pythagorean Theorem: Quick Illustrator
  • Linear Equation Graphs: Thin Slice
  • Congruent Figures
  • Pythagorean Template: Integer Legs
  • What Do You See?

Discover Resources

  • aztec
  • integrales
  • BrumaPinwheels
  • Untitled
  • gcfx
  • s33D

Discover Topics

  • Piecewise Functions
  • Polygons
  • Difference and Slope
  • Right Triangles
  • Interest Calculation
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®