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0. A right triangle, by definition, will never include any obtuse angles.
yes an obtuse triangle has two acute angles
You can draw a triangle with two obtuse angles in a sphere
You will know that a triangle is obtuse if one of its angles is over 90°.
No, an obtuse triangles has one obtuse angle and two acute angles. If a triangle has an obtuse angle, it is considered obtuse and cannot be acute.