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Video Brain Teaser #23
Videos that provide viewers with brain teasers/mental puzzles. These may consist of problems dealing with the arrangement of matchsticks, coins, and other items. May include pencil drawing games, optical illusions, hidden images and “Find the Twin” proble
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chandra_avinash said – Sun, 21 Jun 2009 21:39:25 -0000 ( Flag Edit Link )
if you look carefully at the figure – the angle at the lower right corner is obtuse and that at the lower left corner is acute; as a result, the left diagonal appears to belong to a “much bigger” parallelogram and therefore we feel that it’s the longer diagonal;
it’s actually a really good illusion – but it’s difficult to deduce that the diagonals have the same length – unless we derive a mathematical proof for it (using similar triangles, etc, if possible)
does this help?