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k a = π x 2 x r
= 3,14 x 2 x 6
= 37,68
k b = π x 2 x r
= 3,14 x 2 x 9
= 56,52
b. luas
l a = π x r²
= 3,14 x 6 x 6
= 113,04
l b = π x r²
= 3,14 x 9 x9
= 254,34
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