If one of the angles of a triangle measures 91 degrees, the triangle is a ____.

right triangle

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obtuse triangle

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Cannot be determined.

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acute triangle

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Solution

The correct option is B obtuse triangle
An obtuse triangle (or obtuse-angled triangle) is a triangle with one obtuse angle (greater than 90°) and two acute angles.

So, if an angle of a triangle measures 91°, the triangle is an obtuse triangle.

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△ A B C

2 ∠ A = 3 ∠ B = 6 ∠ C

∠ B

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