10, unless they are non collinear vectors.
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(number of sides) - (2) times (180) = sum of interior angle measurements so for a triangle it is 3-2 which is 1 times 180 = 180, so the answer is 180 degrees
-3 + 4 + (-2) = 1 + (-2) = 1 - 2 = -1.
3
1 1/2 + 1 1/2 = 3
2 and 1 .their sum is 3 .difference is 1