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K = 66 cm
Dijawab :
K = 2πr
66 = 2 . 22/7 . r
66 = 44/7 . r
r = 66 : 44/7
r = 66 x 7/44
r = 10,5
Jadi, jawabannya adalah B.
keliling = 2πr
66 = 2πr
r =
r =
r = 10,5 cm (b)
semoga dapat dipahami