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346,5 = n x r^2
346,5 = 22r^2/7
22r^2 = 2,425.5
r^2 = 110.25
r = V110.25
r = 10.5 Cm
Maka diameter = 21 Cm
Keliling Lingkaran
= n x d
= 22/7 x 21
= 66 Cm
Maaf kalau benar ya kak, soalnya dikelas memang saya gak terlalu cerdas.