How many pairs of adjacent angles are formed.when two lines intersect in a point ?
If two lines AB and CD intersect at a point O, then paris of two adjacent angles are; ∠AOC and ∠COB,∠COB and ∠BOD,∠BOD and ∠DOA,∠DOA and ∠AOC i.e. 4 pairs
1.How many pairs of adjacent angles are formed when two lines intersect in a point?