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In the given figure, ∠1 = 60° and ∠6 = 120°, show that m and n are parallel. |
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Answer» ∠1 = 60° (given) ∠3 = ∠1 = 60° (vertically opposite angle) and ∠6 = 120° (given) ∠3 + ∠6 = 60° + 120° = 180° ⇒ m || n. |
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