No because a right angle is 90 degrees whereas an obtuse angle is greater than 90 but less than 180 degrees
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No, they are not always obtuse, because a scalene triangle can also sometimes be an obtuse triangle (meaning that one interior angle is obtuse), making one exterior angle acute. Scalene triangles also can be a right triangles (meaning that one interior angle is a right angle), which would make an exterior angle a right angle. Then also they can be acute triangles, in this case all 3 exterior angles are obtuse.
Sometimes it has an obtuse angle. If it is just a parallelogram or a rhombus, then it has two obtuse angles.\. If it is also a rectangle or a square, then it has four right angles.
A 90 degree angle is a right angle, or also it can be thought as being neither acute nor obtuse.
obtuse: greater than 90 degrees right: 90 degrees acute: less than 90 degrees
Right angle, equilateral, isosceles and there are also scalene and obtuse triangles.