If you only know one angle, that angle is greater than 90 degrees, then the triangle is obtuse If that angles is equal to 90 degrees, then the triangle is a right triangle. If it is less than 90 degrees, you don't know enough information to classify the triangle.
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There are no triangles with only one angle.
A triangle can have only one right angle (90o). Such a triangle is called a right triangle.
obtuse triangle
A right angle triangle
A triangle cannot have only one angle!