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O केन्द्र लेकर 2.5 सेमी त्रिज्या का एक वृत्त खींचिए। इस वृत्त पर एक बिन्दु P लीजिए। त्रिज्या OP खींचिए । रेखाखण्ड OP के बिन्दु P पर लम्ब PT खींचिए। क्या PT वृत्त की स्पर्श रेखा है?

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O वृत्त का केन्द्र तथा OP = 2.5 सेमी वृत्त की त्रिज्या है। रेखाखण्ड OP के बिन्दु P पर । लम्ब PT खींचा। ∠OPT = 90°

अतः PT वृत्त की स्पर्श रेखा है।

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