Question
Download Solution PDFदो वृत्त बाह्यतः एक दूसरे को बिंदु X पर स्पर्श करते हैं। PQ दोनों वृत्तों के लिए सामान्य उभयनिष्ठ स्पर्श रेखा है जो वृत्तों को बिंदु P और बिंदु Q पर स्पर्श करती है। यदि वृत्तों की त्रिज्या R और r हैं, तब PQ2 ज्ञात कीजिये।
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हम जानते हैं,
उभयनिष्ठ स्पर्श रेखा की लम्बाई = √[d2 - (R - r)2]
जहाँ d वृत्तों के केंद्र के बीच की दूरी तथा R और r वृत्तों की त्रिज्याएँ हैं
PQ = √[(R + r)2 - (R - r)2]
⇒ PQ = √[R2 + r2 + 2Rr - (R2 + r2 - 2Rr)]
⇒ PQ = √4Rr
⇒ PQ2 = 4Rr
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