The sides can add up to any number. The angles, however, always add up to 180o.
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add up all the sides?
A triangle (as you may know) by definiition has 3 sides; if you add up the lengths of all 3 sides, that total is called the perimeter.
Depending on the sizes who knows
They could all be the same length, or two of them could be the same, or they could all be different. In any case, when you add them all up, the number you get is called the "perimeter" of the triangle.
Three sides of equal length and thus all angles are each 60 degrees, because all triangles add up to 180 degrees