It's an made-up mythical pretend fiction, specifically the kind
that does not exist. No triangle can have one of those.
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A triangle that has an angle greater than 90o is an obtuse triangle.
One angle in a triangle can be greater than 90 degrees, but no more than one.
An obtuse triangle.
An obtuse triangle is a triangle that has one angle greater than 90 degrees.
An obtuse triangle has an angle which is greater than 90 degrees.