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~LINGKARAN

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Penjelasan dengan langkah-langkah:

1.) K = π × d

K = 22/7 × 21

K = 22 × 3

K = 66 cm

2.) K = 2 × π × r

K = 2 × 3,14 × 16

K = 6,28 × 16

K = 100,48 Cm

3.) K = π × d

K = 3,14 × 25

K = 78,5 Cm