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1. 3,14 x 25 = 78,5
2. 3,14 x 35 = 109,9
3. 3,14 x 36 = 113,04
B. rumus k = 2 x x r
1. 2 x 3,14 x 1,75 = 10,99
2. 2 x 3,14 x 4,9 = 30,77
3. 2 x 3,14 x 3,6 = 22,61
4. 2 x 3,14 x 8,1 = 50,87