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62,8 =2.3.14.r
62,8 =6,28.r
62,8/6,28=r
10cm=r
b.) d=2.r
d=2.10
d=20cm
62,8 = 3.14 x d
d = 62.8 : 3.14
d = 20 cm (b. diameter lingkaran)
r = d : 2
r = 20 : 2
r = 10 cm (a.jari jari lingkaran )