[BITList] 64 = 65 ? interesting
HUGH
chakdara at btinternet.com
Wed Apr 13 21:09:09 BST 2011
Colin,Frank,
The angles of the two triangles are each 20.56 deg. The angle of the diagonal of the 5x13 rectangle is 21.04 deg. So there is a thin area running up the diagonal whose area is equal to one square. QED.
Hugh.
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