Question
Download Solution PDFकिसी वृत्त पर स्पर्शरेखाओं का एक युग्म खींचने के लिए, जो एक दूसरे से 75° के कोण पर झुकी हों, वृत्त की उन दो त्रिज्याओं के अंतिम बिंदुओं पर स्पर्शरेखाएँ खींचना आवश्यक है, जिनके बीच का कोण है-
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFअवधारणा:
त्रिज्या संपर्क बिंदु पर स्पर्शरेखा के लंबवत होती है।
चतुर्भुज के सभी कोणों का योग = 360°
गणना:
PA और PB बाहरी बिंदु P से वृत्त पर खींची गई स्पर्श रेखाएँ हैं।
∠OAP = ∠OBP = 90° (त्रिज्या संपर्क के बिंदु पर स्पर्श रेखा के लंबवत होती है)
अब, चतुर्भुज OAPB में,
∠APB + ∠OAP + ∠AOB + ∠OBP = 360°
75° + 90° + ∠AOB + 90° = 360°
∠AOB = 105°
इस प्रकार, दो त्रिज्याओं, OA और OB के बीच का कोण 105° है।
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