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

© 2022 GeoGebra

Cosine Law

Author:
Whan Ki Lee, slik
Topic:
Cosine
A demonstration of the Cosine rule. Drag the red points.
The proof for angle A being acute is given. Determine the proof of the Cosine Rule when angle A is obtuse.

New Resources

  • Action/Consequence: Proving Parallelograms
  • G_8.05 Law of sines
  • G_11.01 Radians, arc length and sector area
  • Poorly Drawn Squares
  • Monty Hall Problem

Discover Resources

  • Two Parallel Chords
  • medians of triangles
  • Alemania: face función seno.
  • Geogebra
  • Volume - slices (clear)

Discover Topics

  • Planes
  • Sine
  • Expected Value
  • Distributions
  • Isosceles 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