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=62,8/3,14
=20 cm
62,8 = 2 X 3,14 X r
62,8 = 6,28 X r
62,8 : 6,28 = r
10 = r
jadi, jari-jarinyya 10 cm kak
kalau diameternya = 2 X jari-jari = 2 X 10 = 20 cm