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Answer»

Suppose you have a ∆ABCAll the exterior angles will be equal to(180-A)°(180-B)°(180-C)°respectively (Angles on the same line) so if you sum it up it will be equal to 540 - (A+ B + C )And by angle sum property A+B+C = 180°Therefore Sum = 540 - 180 = 360



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