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Π = 3,14
k . lingkaran = 2Πr
62,8 = 2 x 3,14 x r
62,8 = 6,28 x r
62,8 per 6,28 = r
10 = r
jadi r = 10.
agar lbh meyakinkan bsa coba r (jari jari) dimasukkan dalam rumus :
k = 2Πr
k = 2 x 3,14 x 10
k = 6,28 x 10
k = 62,8