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?

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