Concyclic

Autore:FUKUCHAN

Given triangle ABC and point D on AB. O1 is circumcircle of triangle ADC, O2 is circumcircle of triangle DBC. E on AB, F on O1, G on O2, EF//BC, and EG//AC. Please prove that points D, E, F, and G are concyclic.

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Forming Similar Triangles
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MG1 Brianchons Theorem
Construction 6
Exterior Angle Theorem
Area of sector of circle
Side-Splitter Theorem

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Triangoli equilateri
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