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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A radius of a regular triangle is 12 . find the length of one side of the triangle?
A midsegment of a triangle is parallel to the side of the triangle, and it's length is half the length of that side
The answer depends on what information you do have about the triangle.
Divide the length of a side of one triangle by the length of the corresponding side of the other triangle.
to find the unknown length of the longest side in a right angled triangle provided the length of the other two sides is known.