Given : AB || CD.
If $∠ 4$ is an obtuse angle, then $∠ 5$ is

Acute

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Right

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Obtuse

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Straight

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Solution

The correct option is C Obtuse
As $A B | | C D$ and $E F$ is transversal.
$∠ 5 = ∠ 4$ (Alternate angles)
Now $∠ 4$ is obtuse therefore $∠ 5$ is also obtuse

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