An obtuse triangle is a type of triangle that has one angle that is greater than 90 degrees. In other words, an obtuse triangle has one angle that is "obtuse," which means it measures more than 90 degrees. The other two angles in an obtuse triangle are acute angles, meaning they measure less than 90 degrees.To visually identify an obtuse triangle, you can look for the angle measures. If one angle is larger than 90 degrees, the triangle is obtuse. Another way to identify an obtuse triangle is by looking at the side lengths. The longest side of an obtuse triangle is always opposite the obtuse angle.In terms of the triangle's classification by its sides, an obtuse triangle can be either scalene or isosceles. This means that an obtuse triangle can have all three sides of different lengths (scalene), or it can have two sides of equal length (isosceles).In summary, an obtuse triangle is a triangle with one angle greater than 90 degrees, and it can have either all sides of different lengths (scalene) or two sides of equal length (isosceles).

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