It needs to have two equal angles, each of which is less than 45 degrees.
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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 certainly can be. To draw one, draw a very flat "V" , one with a very wide angle, then connect the top to make a triangle.
No. An obtuse triangle can be isosceles. It just can't be a right or equilateral triangle.