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If the sum of all interior angles of a triangle is not equal to 180° then it is not a triangle...
Sum of all angle of a triangle must be equal to 180°...
(i) 60°+60°+60° = 180° ...Yes
(ii) 40°+40°+40° = 120° ...No
(iii) 70°+70°+80° = 220° ...No
(iv) 130°+20°+30° = 180° ...Yes
(v) 90°+90°+20° = 200°...No
(vi) 35°+55°+90° = 180° ...Yes
Sum of all angle of a triangle must be equal to 180°...
(i) 60°+60°+60° = 180° ...Yes
(ii) 40°+40°+40° = 120° ...No
(iii) 70°+70°+80° = 220° ...No
(iv) 130°+20°+30° = 180° ...Yes
(v) 90°+90°+20° = 200°...No
(vi) 35°+55°+90° = 180° ...Yes
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