Recall, trolI Ulangles are equal. Let us prove this ICproof, and keep those in mind while studying the proUlother, then the vertically o Now,eorem 6.1 : If two lines intersect each other, then tangles are equal.Proof : In the statement above, it is giventhat 'two lines intersect each other'. So, letAB and CD be two lines intersecting at O asshown in Fig. 6.8. They lead to two pairs ofvertically opposite angles, namely(i) L AOC and BOD (ii) L AOD andZ BOCThand刁Examplangle bisSolutionTherefBut,Fig. 6.8: Vertically opposite an TheretSo,

Recall, trolI Ulangles are equal. Let us prove this ICproof, and keep

1.	Recall, trolI Ulangles are equal. Let us prove this ICproof, and keep those in mind while studying the proUlother, then the vertically o Now,eorem 6.1 : If two lines intersect each other, then tangles are equal.Proof : In the statement above, it is giventhat 'two lines intersect each other'. So, letAB and CD be two lines intersecting at O asshown in Fig. 6.8. They lead to two pairs ofvertically opposite angles, namely(i) L AOC and BOD (ii) L AOD andZ BOCThand刁Examplangle bisSolutionTherefBut,Fig. 6.8: Vertically opposite an TheretSo,
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