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Are linear pairs supplementary?
Yes, they are.
Are all linear pairs supplementary angles?
supplementary can sure be a linear pair. As long as their is 2 different angles and they equal 180 degrees.
Is it true or false supplementary angles are always linear pairs?
True only if the two angles are adjacent (i.e. have a point in common). By definition, supplementary angles add up to 180° therefore they are linear pairs, if they are adjacent. Otherwise false. Imagine drawing an angle of 40° at the top of the page and another of 140° at the bottom. These angles are supplementary but not a linear pair.
Why is SeH2 linear and not bent?
The molecule should have 2 atoms with 2 lone electron pairs and be in bent configuration.
What can and cannot be assumed about a figure?
You can assume only given information and some angle relationships such as vertical angles and linear pairs. You cannot assume any ungiven angle measures or relationships of lines such as parallel or perpendicular.
