What is the minimum distance between centers of two circles having radii 5 cm and 3 cm such that exactly three common tangents exist?
What is the minimum distance between centers of two circles having radii 5 cm and 3 cm such that exactly three common tangents exist?
दो वृत्त की त्रिज्याएँ 5 सेमी और 3 सेमी हैं, उनके केंद्रों के बीच न्यूनतम दूरी क्या होगी ताकि ठीक तीन सामान्य स्पर्श रेखाएँ मौजूद हों?
Detailed Solution & Logic
8 cm / 8 सेमी
दिया है:
दो वृत्तों की त्रिज्याएँ = 5 cm और 3 cm
हमें ऐसी स्थिति चाहिए जहाँ exactly 3 common tangents हों।
Step 1: Concept
दो वृत्तों के लिए:
- 4 tangents → जब वे अलग-अलग हों
- 3 tangents → जब वे बाह्य स्पर्श (externally touching) करें
- 2 tangents → जब एक दूसरे को काटें
Step 2: Condition for external touching
बाह्य स्पर्श की स्थिति में केंद्रों के बीच दूरी = त्रिज्याओं का योग
Step 3: Calculation
Distance = $5 + 3 = 8$ cm
Final Answer:
👉 केंद्रों के बीच न्यूनतम दूरी = 8 cm
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