Mathematical experiment… hoax perhaps
For those which still think that this is kind of “mathe-magical” thing… There’s not such a thing 
(i know that this post sounds a bit g33ky but anyway 
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You might be impressed by that, but as far as i can tell, this is full time hoax. And it doesnt hold trigonometric functions as well. Here’s how: (pay attention to ratios between sides)
Summary: Ratios are not the same (3/8 ≠ 2/5), so hypotenuses aren’t parallel, because there’s angle of 1,24 degree.
So, because hypotenuses aren’t parallel, there becomes exactly cm² of space 
Wired, huh?
D.
