GoGeometry Action 28! (Quick Angle Problem)

Author:Tim Brzezinski

Creation of this applet was inspired by a tweet from Antonio Gutierrez. What is the measure of the pink angle? How can you formally prove this to be true?

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ASA New
The 68-95-99.7 Rule
Triangle
vectorproduct
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Discover Topics

Normal Distribution
Sine
Linear Equations
Similar Triangles
Statistical Characteristics