Cosine rule & Pythagoras' Theorem

Topic:Cosine, Pythagoras or Pythagorean Theorem

Drag the RED point to create an non-right angle triangle. How does the COSINE rule extend Pythagoras' theorem to describe non-right angle triangles? (Tick the box to see the Working).

New Resources

Rolling an Equilateral Triangle
Pathway to Proof: Triangle Angles
Building Triangles with Set Areas
Damped Trochoidal Curve
အခြေခံ data အခေါ်အဝေါ်များ

Discover Resources

Average Value of a Function
col2_central
AP 2010AB_4b
Graphing Polynomials
กราฟของสมการเชิงเส้นตัวแปรเดียว

Discover Topics

Constructions
Triangles
Plane Figures or Shapes
Cube
Power Functions