If it's a right triangle, use pythagorean's theorem (a2+b2=c2) to solve it. =
If it's an oblique triangle, use the law of sines or cosines (see related link)
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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
Divide the length of a side of one triangle by the length of the corresponding side of the other triangle.
It is the longest side of a right angle triangle.
It depends on what is known about the triangle.