(i) No, two right angles would up to 180^o so the third angle becomes zero. This is not possible. Therefore, the triangle cannot have two right angles.

(ii) No, a triangle can’t have two obtuse angles as obtuse angle means more than 90^o. So, the sum of the two sides exceeds more than 180^o which is not possible. As the sum of all three angles of a triangle is 180^o.

(iii) Yes, a triangle can have two acute angle as acute angle means less than 90^o.

(iv) No, having angles more than 60^o make that sum more than 180^o which is not possible as the sum of all angles of a triangle is 180^o.

(v) No, having all angles less than 60^o will make that sum less than 180^o which is not possible as the sum of all angles of a triangle is 180^o.

(vi) Yes, a triangle can have three angles equal to 60^o as in this case the sum of all three is equal to 180^o which is possible. This type of triangle is known as equilateral triangle.