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If two sides are given and you need to know the length of the third side use the Pythagrean Theorem formula. Then you find the square root.

c² = a² + b²

* * * * *

That is useful only if the triangle is a right angled triangle. Most are not. The correct answer depends on what information you do have.

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13y ago

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Q: How do you find the unknown length of a triangle?
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