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

Dilation + Rotation of Pentagons
Converting Angle Measures Between Degrees and Radians
Addition within Two Places
Interactive Unit Circle - Exact Trig Values
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Discover Resources

Spline_n_points_v3_java
Sum of interior angle (triangle)
Motion on Ramp and Forces
Incenter & Incircle Action!
GeoGebra Team Competition 1 problem
Lakpa

Discover Topics

Constructions
Translation
Random Variables
Random Experiments
Real Numbers