[alogo] Desargues theorem (perspective triangles)

Start from a triangle t=(ABC) , a point D and a line e. Draw the intersection points A',B',C' on the sides of t of the line (h) through D, parallel to e. Join AA', BB', CC' and build the triangle t'=(A''B''C'') of these lines. Repeat the procedure by replacing t with t'. All these triangles are perspective to t on fixed lines f, g, h, k, which depend only on t, D and e.

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See Also

Desargues.html
Duality.html
Menelaus.html
MenelausApp.html
PappusLines.html
PappusSelfDual.html

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