Angle Trisection -- from Wolfram MathWorld
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Angle trisection is the division of an arbitrary angle into three equal angles. It was one of the three geometric problems of antiquity for which solutions using only compass and straightedge were sought. The problem was algebraically proved impossible by Wantzel (1836). Although trisection is not possible for a general angle using a Greek construction, there are some specific angles, such as pi/2 and pi radians (90 degrees and 180 degrees, respectively), which can be trisected. Furthermore
Angle Trisection Different Modes, PDF, Circle
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Pat'sBlog: Trisecting the General Angle, A Plethora of Pretty Approaches
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Angle trisection - Wikipedia
Angle Trisection Different Modes, PDF, Circle
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A geometric proof of the impossibility of angle trisection by straightedge and compass
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Trisecting an Angle Using a Conchoid - Wolfram Demonstrations Project
Angle Trisection Different Modes, PDF, Circle
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Does an obtuse angle triangle have an orthocenter? - Quora
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Wolfram Mathworld in the Notebook Archive
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Pascal's Angle Trisection - Wolfram Demonstrations Project