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2. L = Πr² = 22/7 42 = 22 6 = 132 cm²
3. L = Πr² = 22/7 42 = 22 6 = 12 dm²
4. L = Πr² = 22/7 17,5 = 22 2,5 = 55
5. L = Πr² = 22/7 15 = 330/7 = itung sendiri lah :v hahaha