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

Hypocycloids
Translation of the Graph of a Function
Intersections of y=a^x and y=log(a, x)
Graphing 1 + cos(θ) in Polar Coordinates
Difference engine Babbage vb 2

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Τετράπλευρο με ένα ζεύγος απέναντι γωνιών ίσες
Circumscribed Triangle
Fourty Five 45 90 Triangle
Trancated Square antiprism. Dependence of the average distance between the vertices of a polyhedron on the truncation parameter. Extreme distribution.
Examples of intersections of planes

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Differential Calculus
Logarithmic Functions
Indefinite Integral
Matrices
Root