they can be obtuse say ther are two lines intersecting two of the angles are acute (50degrees) that means the other pair must be obtuse 180-50=130 so the other two angles are obtuse with a measurement of 130degrees
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Because they are obtuse angles!
No
Vertical angles can be acute, right (if the intersecting lines forming them are perpendicular) or obtuse.
yes
Only if you add them it is possible but not by themselves