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exercises/triangle/README.md

 
 An _equilateral_ triangle has all three sides the same length.
 
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 An _isosceles_ triangle has at least two sides the same length. (It is sometimes
 specified as having exactly two sides the same length, but for the purposes of
 this exercise we'll say at least two.)
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+An _isosceles_ triangle has at least two sides the same length.
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 A _scalene_ triangle has all sides of different lengths.