This will depend upon the type of triangle.
For an equilateral, all sides will be the same length.
For a right angle triangle, the formula a2 + b2 = c2 is used.
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Two sides of a triangle do not, automatically, give you the measure of the third side. Further information about the triangle is required.
20.
Doesn't it depend on what type of triangle it is? And which sides you are measuring? And which side it's laying on?
Well all you have to do, is add the two 4's up, and you obviously get 8, and then you subtract 8 from 180 to get your third side.... which is 172º.
It is not possible to determine the measure of an angle if the lengths of two sides are given.