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K = 2 x 22/7 x 42
K = 264cm
L = phi x r x r
L = 22/7 x 21 x 21
L = 1.386cm persegi
4. K = 2 x phi x d
K = 2 x 22/7 x 84
K = 528cm
L = phi x r x r
L = 22/7 x 42 x 42
L = 5.544cm persegi
5. K = 2 x phi x d
K = 2 x 22/7 x 98
K = 616cm
L = phi x r x r
L = 22/7 x 49 x 49
L = 7.546cm persegi
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