A triangle with one angle measuring 120 degrees is called a ___ angled triangle.
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obtuse angled triangle
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An obtuse-angled triangle is a triangle in which one of the interior angles measures more than 90° degrees. ... Since, ∠A is 120 degrees, the sum of ∠B and ∠C will be less than 90° degrees. In the above triangle, ∠A + ∠B + ∠C = 180° (because of the Angle Sum Property) Since ∠A = 120°, therefore, ∠B + ∠C= 60°.
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