Cut-the-Knot-Action 13!

Author:Tim Brzezinski

Creation of this applet was inspired by a tweet from Alexander Bogomolny. LARGE points are moveable at any time. How can you formally prove what this applet informally illustrates?

New Resources

Writing and Graphing Proportional Relationships (k>0)
Congruent Figures
Angle Addition Postulate (V2) - Integer Solutions
Isosceles Right Triangle
Midpoint Theorem (V2): Integer Solutions

Discover Resources

Area of triangles
Points on two lines - simultaneous equations
The normal distribution
Finding the Trig Ratios
Italia: Teorema de la tangente y secante n-2.

Discover Topics

Tangent Function
Similarity Transformation or Similarity
Trigonometric Functions
Scalene Triangles
Tree Diagrams