Concyclic

作者：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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Quad into a parallelogram
Naming lines 2
notes day 20 (2)
Ficha Interativa Geogebra Altura do Triângulo
Matching Slopes of Parallel Lines

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直線
橢圓
球形
分數
矩形

Concyclic

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