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Determining whether a triangle is valid is easier than you think. All you need to do is use the triangle inequality theorem: in a triangle, the sum of the lengths of any two sides is always greater than the length of the other side. If all three additions of the side lengths match this theorem, you get a triangle. [1] X Research Source
- For example, a = 7, b = 10 and c = 5.
- a + b > c = 17 > 5
- a + c > b = 12 > 10
- b + c > a = 15 > 7
- 5 + 8 > 3 = 13 > 3, so a valid edge.
- 5 + 3 > 8 = 8 > 8. This is not true so you can stop and conclude: this triangle is not valid.
Advice
- These are all basic additions, so as long as you get them right the process is simple.
wikiHow is a “wiki” site, which means that many of the articles here are written by multiple authors. To create this article, 31 people, some of whom are anonymous, have edited and improved the article over time.
This article has been viewed 10,052 times.
Determining whether a triangle is valid is easier than you think. All you need to do is use the triangle inequality theorem: in a triangle, the sum of the lengths of any two sides is always greater than the length of the other side. If all three additions of the side lengths match this theorem, you get a triangle. [1] X Research Source
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