So, the two red triangles are not congruent; nor are the two dark green triangles. Sleazy. Euclid can rest in peace. Thanks to Andre Routh for this explanation. The paradox is originally due to Paul ...
Triangles ABC and GHI are congruent. Triangle GHI is the same as ... Image caption, Isosceles triangles ABC and DEF are not proportionality the same. The base in EF is twice the size as BC.
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