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b. L1 : L2 = r1² : r2² = 6² : 9² = 36 : 81 = 4 : 9
2. pi. r1 : 2. pi. r2
6 :9
2:3
b) L1 : L2
pi . r1. r1 : pi. r2.r2
6.6 : 9.9
4 :9