It is possible for a triangle to be both isosceles and obtuse. Then the correct answer is option D.
What is an isosceles triangle?
The triangle in which the two opposite sides are equal and the two opposite angles are equal is called the isosceles triangle.
In the isosceles triangle, if the angles are:-
Triangle ABC, ∠A = ∠B = 30 (isosceles) and ∠C = 120 (obtuse)
Sum of the angle = 30+30+120 = 180
Hence, the correct answer is option D.
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