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no 12 jwbnya d (3.850)

12. r = 35 cm, π = 22/7
L = 22/7 × 35 cm × 35 cm
L = 3850 cm^2

13. L = 2464 cm^2 , π = 22/7
L = π×r×r
2464 = 22/7×r×r
r = 28 cm


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