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In figure, the line l || m then find the angles which are equal to ∠1.

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∴ l || m

⇒ ∠1 = ∠3 (Vertically opposite angles)

Also ∠1 = ∠5 (Corresponding angles)

∠5 = ∠7 (Vertically opposite angles)

Hence, ∠3, ∠5 and ∠7 are equivalent to ∠1.

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