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?

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apec
Comparing Two Quantities by Percentage
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Vector Valued Functions
Nikmati Keunggulan Di Bandar Judi Terpercaya

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Perpendicular Line from Chord
Halveringstid
nombre rationnels en un nombre peridoque
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Geometry - Circumcenter Solution

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Optimization Problems
Quadrilaterals
Conditional Probability
Cone
Ellipse