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= 25.12
b. k = 2×3.14×10
=62.8
2. a. k= 2x3.14×2.5
= 15.7
b. k= 2×22/7×56
=352
B. 3,14 x 10 = 31,4
2. A. 2 x 3,14 x 2,5 = 15,7
B. 2 x 3,14 x 56 = 351,68