GeoGebra
GeoGebra
  • Home
  • News Feed
  • Resources
  • Profile
  • People
  • Classroom
  • App Downloads
About GeoGebra
Contact us: office@geogebra.org
Terms of Service – Privacy – License

© 2023 GeoGebra

Tan(a+b) proof without words

Author:
Gary Rubinstein

You can move the green points. How does this diagram prove that ?

New Resources

  • interior - squares with kufic writing
  • Kukeldash madrassa (2) - gp
  • Bibi Khanum mosque - S-wheel pattern - ks
  • Area of the Shaded Region (1)
  • Bibi Khanum mosque - weave pattern side wall - ks

Discover Resources

  • Pythagorean Theorem. 3x-4x-5x Triangle
  • Test Book
  • tang pt exterieur
  • การบวกจำนวนเต็ม
  • f(x) = 1/g(x) - Plotter

Discover Topics

  • Isosceles Triangles
  • Integral Calculus
  • Variance
  • Quadratic Functions
  • LCM and GCD

GeoGebra

  • About
  • Partners
  • GeoGebra on Tests
  • News Feed
  • App Downloads

Apps

  • Calculator Suite
  • Graphing Calculator
  • 3D Calculator
  • CAS Calculator
  • Scientific Calculator

Resources

  • Classroom Resources
  • Learn GeoGebra
  • Classroom
  • Geometry
  • Notes
  • Terms of Service Privacy License
  • Facebook Twitter YouTube