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56 lines
1.7 KiB
Markdown
56 lines
1.7 KiB
Markdown
# 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.<br/>
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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.)<br/>
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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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## Elm Installation
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Refer to the [Exercism help page](http://exercism.io/languages/elm) for Elm
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installation and learning resources.
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## Writing the Code
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The first time you start an exercise, you'll need to ensure you have the
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appropriate dependencies installed.
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```bash
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$ npm install
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```
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Execute the tests with:
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```bash
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$ npm test
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```
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Automatically run tests again when you save changes:
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```bash
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$ npm run watch
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```
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As you work your way through the test suite, be sure to remove the `skip <|`
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calls from each test until you get them all passing!
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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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