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78 = 2 x 22/7 x r
78 = 44/7 x r
r = 88 x 7 / 44
r = 14 cm
kalo salah bilang yaa~
78 = 2.22/7.r
78/2 = 22/7.r
39.7/22 = r
r= 12,41 cm
L = 22/7.12,41.12,41
L = 484,025 cm2