The two angles of a linear pair must add to 180 degrees. So if one is less than 90 degrees (acute) the other must be more than 90 degrees (obtuse).
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Oh, isn't that interesting? When we have a linear pair of angles, one angle is always supplementary to the other. So if one angle is obtuse, which means it's more than 90 degrees, then the other angle must be acute, which means it's less than 90 degrees. It's all about balancing each other out, just like adding a touch of light to a dark painting to create harmony.
No, because they wouldn't add up to 180 degrees. An acute and obtuse COULD.
They make a pair of acute angles and a pair of obtuse angles. In rotational order, the angles are acute, obtuse, acute, obtuse.
Not too sure of the question but in general an obtuse angle is greater than 90 but less than 180 degrees