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

© 2022 GeoGebra

Angle Bisector Surprise

Author:
Ted Courant
A quarter-circle and semi-circle are inscribed in a square, as shown, and a (blue) point on the quarter circle is given (which you can drag). Join the square's corner to the blue point.
Prove that the indicated angles are equal.

New Resources

  • Area of a Circle
  • A2_6.06 Graphing tangent functions_1
  • A2_6.02 Evaluating trigonometric functions_2
  • A2_6.02 Evaluating trigonometric functions_1
  • Matrix Transformations

Discover Resources

  • Concepte de derivada en un punt
  • Example to show how to keep constant 1:1 ratio on resize
  • Animated Car
  • การบวกจำนวนเต็มบวกกับจำนวนเต็มลบ
  • ייצוג קוטבי למספר מרוכב

Discover Topics

  • Right Triangles
  • Upper and Lower Sum or Riemann Sum
  • Median Line
  • Random Variables
  • Similar Triangles

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