Importance of parallelograms
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- Error Analysis of Approximation from Limits Towards Infinity
- Error Analysis: Taylor's Theorem for Constant Approximation
- Building up to SAS congruence: only using translations and rotations
- Angle bisector theorem
- Equivalence with normal constructions
- Link to projective theorems (including Ceva, Menelaus, Pascal, Brianchon, Desargue, Monge)