no. obtuse simply means one of its angles in greater than 90 degrees, whereas isosceles is determined but the side lengths. they are not directly linked.
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An obtuse triangle is not necessarily isosceles, but it can be.
-- An isosceles triangle can also be an obtuse triangle but it doesn't have to be. -- An obtuse triangle can also be an isosceles triangle but it doesn't have to be. So there's no consistent diferences betwen them.
It can be an isosceles triangle or a scalene triangle if it has 1 obtuse angle
It doesn't matter if a triangle is isosceles, scalene, obtuse, acute... There are always 3 angles in a triangle (which add up to 180).
No. An obtuse triangle can be isosceles. It just can't be a right or equilateral triangle.