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The angle bisectors always intersect inside the triangle. (This is not true for altitudes and right bisectors.)
No. Not if the triangle is right angled (the intersection is AT the right vertex) or obtuse angled (intersection outside).
The three angles inside any triangle always add up to 180 degrees.If one of them is 90 degrees, then the triangle is a right triangle.
The three angles inside EVERY triangle ALWAYS add up to 180 degrees.In an isosceles right triangle, the angles are 45°, 45°, and 90°.
No. An isosceles right triangle is a special case. There are many right triangles which are not isosceles.