56 57 and 58
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The numbers are: (-12+square root of 171) and (-12-square root of 171)
They have three connecting lines. The three interior angles add up to 180 degrees. The three exterior angles add up to 360 degrees.
21
93, 2, 1 are three numbers that add up to 96
if you mean what three prime numbers add up to a prime number then the answer is : 5 + 7 + 11 = 23