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rumus luas lingkaran = pi x r^2
22/7 x r^2 = 154/21
r^2 = 154/21 x 7/22
r^2 = 7/3 ~ 2,3
r= akar 2,3 ~ 1,52
rumus keliling lingkaran = 2 pi r
2 x 3,14 x 1,52 = 9,59 ~ 9,6 cm
jadi kelilingnya 9,6 cm