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π .d = 7/2
22/7 . d = 7/2
d = 7/2 . 7/22
d = 49 / 44
r = 49/44 : 2
r = 49 / 88 cm
Keliling 66 cm
π.d = 66
22/7 . d = 66
d = 66. 7/22
d = 3 . 7
d = 21
r = 10,5 cm
Maaf kalau salah