Yes providing that the other two angles are acute
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Yes. Every triangle with an obtuse angle must have two acute angles.
because if it is obtuse, there is no right angle. each corner has to be over 90 degrees (a right angle) to be an obtuse triangle.
no; a triangle must have an obtuse angle if one of its altitudes is outside of the triangle, and in this case 2 of the altitudes are out of the triangle.
Yes.
An obtuse triangle has one angle greater than 90 degrees and a right triangle has one angle exactly 90 degrees.