it i a triangle that only has one obtuse angle
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An obtuse triangle is not necessarily isosceles, but it can be.
It can be but need not be.
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It can be an isosceles triangle or a scalene triangle if it has 1 obtuse angle
All isosceles triangles must have two congruent sides otherwise it is not isosceles. Whether it is acute angled, right angled or obtuse angled is irrelevant.