Lifting the veil

A blue triangle and a red rectangle with an extended side. Prove they have equal area.

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Solution by Stéphane Bernard.


Please find here the video solution: Video: Lifting the veil.

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One reply on “Lifting the veil”

As shown in figure draw BB’ perpendicular to AC.
Area of Rectangle = a.y
Area of Triangle ABC = (a.2Sin(x)Cos(x).y)/(2Cos(x))=a.y

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