See down:





































8/3 is different of 5/2... ;-)

Slope concave before Slope convex... and we win a square...

Mathematically:

Forms are into a rectangle 13x5
Empty area on the top of this rectangle is done by:

In the first case:
-a rectangle 8x2, a triangle (8x3)/2, a triangle (5x2)/2
OR : 16+12+5=33

In the second case:
- a rectangle 5x3, a triangle (8x3)/2, a triangle (5x2)/2
OR : 15+12+5=32

The difference is the little square.



Very nice (old) enigm.

And good picture.

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