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Properties of Angles Formed by Two Parallel Lines and a Transversal

In the given ...

Question

In the given figure
If $∠ 2 + ∠ 3 = 180 °$ then lines $l$ and $m$ are _____

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Solution

When the sum of co-interior angles are $180 °$ then two lines are parallel.
Hence, If $∠ 2 + ∠ 3 = 180 °$ then lines $l$ and $m$ are parallel.

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