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Is the useless one useless?

regain00 The concept of "Is the useless one useless?"
regain01 Isosceles triangle and the length of parallel segments
Origical theorem

If not segment BC but line BC

If not isosceles triangle

regain02 Inscribed angle
Starting point

Two results

What relationship?

It becomes quadrangle when showing two results at the same time

regain03 The length of median
Starting point

Parallelogram and so on


Two triangles?

Two triangles?


How about this?

Hint : looking back


Forum of Gemetric Constructor by Y.Iijima