Yes, they can, if they are both 90 degrees.
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No, right angles are 90 degrees, supplementary and vertical angles are 180 degrees.
Vertical angles can be supplementary angles if the lines are perpendicular and then both of the vertical angles would be 90 digress.
Supplementary.
If the lines are perpindicular then each pair of vertical angles are supplementary
No because two angles do not have common vertex