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If your informal proof is to draw a picture and say "it's obviously true by lookikg at it", then you don't need a parallelogram at all. Just draw the diametric
by lupire 2y ago
If your informal proof is to draw a picture and say "it's obviously true by lookikg at it", then you don't need a parallelogram at all. Just draw the diametric triangle and look at it.
- rocqua 2y agoHence the addition of a formal proof based on the bisectors of opposite edges of a parallelogram.