Triangle Inequality Theorem Calculator

Scalene Triangle
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Enter any 3 side lengths and our calculator will do the rest
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Your 3 side lengths ( ) are invalid .

Side Lengths of do not adhere to the triangle inequality theorem. which states that the sum of the side lengths of any 2 sides of a triangle must exceed the length of the third side. Read more about this rule here.
Your 3 side lengths ( ) are invalid .

Side Lengths of a do not adhere to the triangle inequality theorem. which states that the sum of the side lengths of any 2 sides of a triangle must exceed the length of the third side. Read more about this rule here.
Why is the calculator saying there's an error when there shouldn't be?

The most frequent reason for this is because you are rounding the sides and angles which can, at times , lead to results that seem inaccurate. In these cases , in actuality , the calculator is really producing correct results. However, it is then rounding them for you- which leads to seemingly inaccurate results and possible error warnings . To see if that is your problem, set the rounding to maximum accuracy.

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