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K = 3,14 x 20 cm
K = 62,8 cm.
Maaf klo salah
K = πd
Dik : r = 10 cm --> d = 2r = 2.10 = 20 cm
DIt : K
Jawab :
K = πd
= x 20
K = 62,8 cm
Jadi, Keliling Lingkaran tersebut adalah 62,8 cm