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2 x 22/7 x r = 220
44/7 x r = 220
r = 220 x 7/44
r = 70
a. jarak terjauh = Diameter
D = 2r
D = 70 x 2 = 140cm
b. titik tengah keujung = jari-jari
jari-jari = r = 70cm