can an acute angle be adjacent to obtuse angle?

*Hey there!* Yes, an acute angle can be adjacent to an obtuse angle. In this diagram you can see one of the angles in the linear pair ( two angles sharing a common vertex, common arm and are adjacent to each other ) is 45 degrees ( which is an acute angle ) and the other angle is 135 degrees ( the angle on the left side ) and it is an obtuse angle.

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