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So for sp, the bond angle is 180. We can say (sort of) that 50% of this is contributed from the s and 50% is contributed from the p (because sp is one half s and one half p). For sp2, the bond angle is 120. Now about 33% of the angle is from the s and 67% is from the p (sp2 is one third s and two thirds p). In this case, as s influence decreased (50% to 33%), the bond angle decreased (180 to 120). We can then say that as s character increases, the bond angle increases as well.
Basically, as we move from sp to sp2 to sp3 to etc, the bond angles are shrinking. sp has the greatest s-character since there is only one p and it has a bond angle of 180 while sp3 has a smaller s-character and has a bond angle of 109.5
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