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ANY two angles that total 90o, eg the "other" angles in a right-angled triangle.
A polygon with six or more sides, in which four of the angles are right angles and the other angles are not. These others are of any type - as required. It cannot be a pentagon because, if 4 angles are right angles, the fifth would be 180 degrees!
A right triangle can have 2 equal angles if they are each 45° (any other right triangle will have no equal angles)
No, these are two quite different things. "Supplementary" means that the sum of the angles is 180 degrees. The angles need not be consecutive; on the other hand, two consecutive angles can have any measure, not always 180 degrees.No, these are two quite different things. "Supplementary" means that the sum of the angles is 180 degrees. The angles need not be consecutive; on the other hand, two consecutive angles can have any measure, not always 180 degrees.No, these are two quite different things. "Supplementary" means that the sum of the angles is 180 degrees. The angles need not be consecutive; on the other hand, two consecutive angles can have any measure, not always 180 degrees.No, these are two quite different things. "Supplementary" means that the sum of the angles is 180 degrees. The angles need not be consecutive; on the other hand, two consecutive angles can have any measure, not always 180 degrees.
Adjacent angles are simply two angles that are next to one another and share one side. There is nothing else unique about these angles, and they are measured as one would measure any other angles.