Question 1179537
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Same-side interior angles are on the same side of the transversal line, and also inside the parallel likes like so
{{{
drawing(400,400,-5,5,-5,5,
line(-10,2,10,2),
line(-10,-2,10,-2),
line(-10,15,10,-15),
locate(-1,2,"a"),
locate(1.5,-1.5,"b")
)
}}}


Since we have parallel lines, the same side interior angles are supplementary. They add to 180 degrees.
a+b = 180
b = 180-a
b = 180-30
b = 150 


Tutor mananth would be correct if a,b were alternate interior angles
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