A triangle with one angle greater than 90 degrees is called what?

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Multiple Choice

A triangle with one angle greater than 90 degrees is called what?

Explanation:
Classifying triangles by their angles: if a triangle has an angle larger than 90 degrees, it is an obtuse triangle. In such a triangle, that one angle is obtuse while the other two are acute, and the angles still sum to 180 degrees. This distinguishes it from acute triangles, which have all angles less than 90; from right triangles, which have exactly one angle of 90; and from equilateral triangles, which have all three angles equal to 60 degrees (and all sides equal). So a triangle with one angle greater than 90 degrees is an obtuse triangle.

Classifying triangles by their angles: if a triangle has an angle larger than 90 degrees, it is an obtuse triangle. In such a triangle, that one angle is obtuse while the other two are acute, and the angles still sum to 180 degrees. This distinguishes it from acute triangles, which have all angles less than 90; from right triangles, which have exactly one angle of 90; and from equilateral triangles, which have all three angles equal to 60 degrees (and all sides equal). So a triangle with one angle greater than 90 degrees is an obtuse triangle.

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