18. If two lines intersect at a point, then the vertically opposite angles are always ( यदि दो रेखाएं एक दूसरे को प्रतिछेद करती हैं तो इस प्रकार बने शीर्षाभिमुख कोण ____ होते हैं ) Required question
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if two lines intersect at a point then vertical angles are always equal .
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