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AR15.COM
2/7/2006 9:58:10 PM EDT
www.ebaumsworld.com/trigrid.html

more weird oneswww.ebaumsworld.com/illusions.shtml
2/7/2006 10:02:54 PM EDT
[#1]
Use a straight edge and u'll see the slope of the 2 wedges are different.  The Surface area of the 2 configurations is the same but you can't calculate it by assuming the whole assembly is a triangle.
2/7/2006 10:04:51 PM EDT
[#2]
Here, try this something a little less advanced;