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It can be an isosceles triangle or a scalene triangle if it has 1 obtuse angle
it i a triangle that only has one obtuse angle
Only when it has 2 equal acute angles and 1 obtuse angle that it is an isosceles triangle
An isosceles triangle can have an obtuse angle and two equal acute angles in which all 3 angles add up to 180 degrees.
An obtuse triangle is not necessarily isosceles, but it can be.