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For the diagram below where lines a and b are parallel, what would be the reason for the statement "Angles 5 and 4 add to 180 °.

For the diagram below where lines a and b are parallel, what would be the reason for-example-1
User Mimoid
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Angles 4 and 5 are the pair of non-adjacent interior angles that lie on the same side of the transversal, these can be understood as consecutive interior angles and are always supplementary, meaning the sum of both is 180°.

User VoidVolker
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