The area enclosed between the circumference of two concentric circles is 16 π sq. cm and their radii are in the ratio of 5 : 3. What is the area of the outer circle? दो संकेंद्रीय वृत्तों की परिधि के बीच का क्षेत्रफल 16 π वर्ग सेमी है और उनकी त्रिज्याओं में अनुपात 5: 3 है । बाहरी वृत्त का क्षेत्रफल कितना है?

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