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A triangle can never include a right angle and an obtuse angle together in it.
Yes. A right triangle is a triangle where one angle is a right angle. If two out of three angles are right angles, then it's an isosceles triangle. If all three angles are right angles, then it is an equilateral triangle.
The angles of a triangle always add up to 180o. A right angle triangle has angle of 90o, 60o, 60o.
The angle bisectors always intersect inside the triangle. (This is not true for altitudes and right bisectors.)
Never but an isosceles triangle can sometimes be a right angle triangle