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NO!!! All four angles are right-angles (90 degrees) The word 'rectangle' means -right-angled quadrilateral.
It is a right angle
acute
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.
None. Obtuse means >90°; acute means <90°; a right angle = 90°. See Relevant Answers. Or look up "rectangle" in a dictionary; also "obtuse".