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Originally Posted by crook
This is a typical case of optical illusion. It is very simple. Take the 'tan' of the angle at the top using the upper block. I mean, in first figure - take the tan of top angle using the top green triangle & in the second, the top red triangle.
The value is different in each case. This explains that the second triangle is not a perfect triangle.
 I think I got it right.
Crooook
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well a second possibility cud be as follows:
if we look at the picture... we shall notice the base of the triangle is longer w.r.t the perpendicular. this is because (in the first picture) the triangle in red has a long base to add up with the base of the initial triangle....
now if we re-arrange the blocks... we have placed this longer base red triangle on the top while a triangle with a smaller base (the green one) is placed at the bottom... now to maintain the same base as b4 the two " L" blocks have to be placed at a block's gap.... more over they bein initially designed to interlink to form a vertical block have now been used vertically... so they go out of order...
i hope i was fair enough to explain my point... do let me know in case of ne doubts...