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ObtTr, short for "Obtuse Triangle," is a type of triangle in Euclidean geometry characterized by having one angle that is greater than 90 degrees. This angle is known as the obtuse angle, and it is the only angle in the triangle that exceeds 90 degrees. The other two angles in an obtuse triangle are acute angles, meaning they are both less than 90 degrees. The sum of the interior angles in any triangle, including obtuse triangles, is always 180 degrees.

Obtuse triangles can be further classified based on the relationship between their sides. If the side opposite the obtuse angle is the longest side, the triangle is called an obtuse scalene triangle. If the side opposite the obtuse angle is equal in length to one of the other two sides, the triangle is called an obtuse isosceles triangle. If all three sides are of equal length, the triangle is an equilateral triangle, which cannot be obtuse because all its angles are 60 degrees.

The properties of obtuse triangles make them useful in various mathematical and practical applications. For example, they are often used in the design of bridges and buildings to create stable structures. In mathematics, obtuse triangles are studied in trigonometry and geometry to understand the relationships between angles and sides.