Once again consider the figures below. Now note that the
red and blue triangle have a differtent slope! (Red triangle: 2/5 = 0.4, blue
triangle 3/8 = 0.375) Which means that the two figures aren't real triangles...)
So, a little bit exaggerated in the figures below, the purple
area is the appearing area in the figure...
This puzzle can be found on our site in two flavours. It is
also presented under:
Square And Rectangle.
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