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Area of a Trapezoid by Similarity

Autor:John Golden
Tópico:Área, Trapézio
Inspired by Ed Southall's trapezoid musings. http://solvemymaths.com/2015/03/07/proof-area-of-a-trapezium-trapezoid-us/ In the sketch, it is set up so BC<=AD. Is that an okay assumption to make?

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