Have a very close look at the point 5 spaces along and 2 spaces up from the bottom left hand corner of both illustrations.

]]>The partitions are exactly the same in the two triangles, how can it be possible that if the surfaces are the same, there is one block missing?

Lets say 1 block equals 1 cm^2

So the area of the triangle is:

(13*5)/2=65/2=32,5 cm^2

Take a look to the area of the different geometric shapes:

Red triangle: (3*8)/2=12 cm^2

Dark green triangle: (2*5)/2=5 cm^2

Orange shape: 7 cm^2

Green shape: 8 cm^2

Total area = 12+5+7+8=32 cm^2

There is a half block missing, but where?

Help please!

]]>Please post any comments on this. I still don't know the solution.

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