Define Angle


Draw an angle mark. First the vertex of the angle must be drawn before. Select one side of the angle, then select the other. Then a angle mark from the first side to the second side is drawn with the degree of the angle near the mark.

angle1

Important Notice:

Here we are using full-angles instead of the traditional angles defined in geometry textbooks. Two full-angles are equal (congruent) iff they have:

  1. The same orientation and the same degree. Or
  2. The opposite orientations and the sum of two angles is 180.
The full-angle method can automatically generate short (sometimes even shorter than those given by geometry experts) and elegant proofs of some extremely difficult theorems.

 

 

 

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