54 lines
1.8 KiB
Markdown
54 lines
1.8 KiB
Markdown
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# Triangle
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Determine if a triangle is equilateral, isosceles, or scalene.
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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
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specified as having exactly two sides the same length, but for the purposes of
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this exercise we'll say at least two.)
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A _scalene_ triangle has all sides of different lengths.
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## Note
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For a shape to be a triangle at all, all sides have to be of length > 0, and
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the sum of the lengths of any two sides must be greater than or equal to the
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length of the third side. See [Triangle Inequality](https://en.wikipedia.org/wiki/Triangle_inequality).
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## Dig Deeper
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The case where the sum of the lengths of two sides _equals_ that of the
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third is known as a _degenerate_ triangle - it has zero area and looks like
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a single line. Feel free to add your own code/tests to check for degenerate triangles.
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* * * *
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For installation and learning resources, refer to the
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[Ruby resources page](http://exercism.io/languages/ruby/resources).
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For running the tests provided, you will need the Minitest gem. Open a
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terminal window and run the following command to install minitest:
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gem install minitest
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If you would like color output, you can `require 'minitest/pride'` in
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the test file, or note the alternative instruction, below, for running
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the test file.
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Run the tests from the exercise directory using the following command:
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ruby triangle_test.rb
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To include color from the command line:
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ruby -r minitest/pride triangle_test.rb
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## Source
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The Ruby Koans triangle project, parts 1 & 2 [http://rubykoans.com](http://rubykoans.com)
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## Submitting Incomplete Solutions
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It's possible to submit an incomplete solution so you can see how others have completed the exercise.
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