Trisect a right angle.

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Trisect hi-res stock photography and images - Alamy

euclidean geometry - Proof of folding to trisect a right angle

Angle trisection

In figure given below, triangle PQR is right angled at Q and the points S and T trisect the side QR. Prove

Angle trisection

Angle Trisection -- from Wolfram MathWorld

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A geometric proof of the impossibility of angle trisection by

Maths in a minute: Trisecting the angle

Trisecting an angle of 90 degrees using method 1

Trisecting the Angle