Option 1: A triangle cannot be right-angled and obtuse at the same time.
Therefore it is impossible to draw a right obtuse triangle.
Option 2: An equilateral triangle refers to a triangle with all the sides equal to each other as well as all angles equal to each other. A triangle cannot be scalene and equilateral at the same time.
Therefore it is impossible to draw an equilateral scalene triangle.
Option 3: It is possible to draw an acute isosceles triangle.
Option 4: A triangle cannot to equilateral and right-angled at the same time.
Therefore it is impossible to draw a right equilateral triangle.
Option 5: It is possible to draw a right scalene triangle.
Therefore the correct answer is option 1 , 2 and 4.
