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Line k is parallel to line l

Line k is parallel to line l-example-1

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Hi,
Angle 1. From what I have learnt, Angle 4= Angle 1 and their angle property is known as the vertically opposite angles :)
Hope this helps :)

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User Ianks
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Angle 1. Because angle 4 and 1 are vertical angles and vertical angles are congruent. 
User Denisvm
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