Three numbers may or may not define a right triangle. Also, the answer will depend on whether the three numbers are the lengths of sides or the measures of angles.
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you multiply all numbers you see. If triangle you multiply all numbers then divide it by three
if the triangle has one right angle in it
Sure, that is exactly what the triangle inequality tells us!
It is a right angle triangle and its largest angle is 90 degrees
If it's not a right angled triangle and you don't have any of the angles but have the values of all three sides, then you need to use something called the Cosine Rule.