Posts: 291
From: Up North
Registered: Apr 2005

posted June 14, 2006 04:15 PM         

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Cool! I was suckered into thinking this was some kind of magic at work at first! Clever.

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Posts: 2681
From: ohio
Registered: Aug 2004

posted June 14, 2006 05:05 PM         

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The first one I figured out, but this triangle one has me stumped...

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Posts: 11943
From: Pleasanton, CA, USA
Registered: May 2005

posted June 14, 2006 05:33 PM         

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That's a good one, too. The best I can figure is that mathematically there's half a square unit unaccounted for.

Volume of a triangle with a 90 degree angle in it is half whatever the square or rectangle would be if you joined it with a matching triangle. So, in easy terms it's:

13 x 5 = 65
65/2 = 32.5

The total volume of the triangle is 32.5 sq. units.

The inside shapes only total 32 sq. units. The box shapes are 7 & 8, and the triangles are 12 & 5. Those only total 32. I can only guess that it's an optical illusion.

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Posts: 1451
From: England
Registered: Dec 2004

posted June 16, 2006 01:37 PM         

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I didn't get that second one. And now I have the sound of a running stream constantly going on my computer

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