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

  • Locus Related to Descartes' Folium
  • Prism Drawn in 1-Point Perspective
  • Using Experimental Probability to Estimate π - Monte Carlo Method
  • Reflection across a line
  • Reflection Across 2 Parallel Lines

Discover Resources

  • Linear Functions-A Car Problem
  • Multiplying by 125
  • القطعة المتوسطة في المثلث
  • אווז

Discover Topics

  • Function Graph
  • Quadrilaterals
  • Curve Sketching
  • Median Value
  • Power Functions
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®