Perimeter -2 known sides = 3rd side
180 -2 known angles = 3rd angle
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They are used to find the angle or side measurement of a right triangle. For example, if 2 sides of a right triangle have known values and an angle has a known measurement, you can find the third side by using sine, cosine or tangent.
Find the square root of one side squared plus the second side squared.
The sum of the 2 smallest sides of a triangle must be greater than the length of its longest side
a2 +b2 = c2 (c is the longest side/or hypotenuse)
Third side = sqrt(hyp2 - opp2)