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1)- one angle =60degree
let the other angle be X
X +60 degree=180degree(linear pair)
x=180degree -60 degree=120degree
therefore the other angle is 120 degree
2)- one angle forming linear pair=135 degree
let the other angle be y
135+y=180 (.linear pair )
y=180-135=45degree
hence the other angle is 45 degree
3)-. if one of the angles of a linear pair is acute then the other angle have to be obtuse because then the sum 180 will be possible
therefore the other angle have to be obtuse
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