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Nomor 2.
Bag a.
850 putaran dalam 1 menit
850 x 360° / menit
306.000° / menit
Bag b.
Jika 850 putaran 1 menitnya,
maka dalam 1 jam,
850 x 60 = 51.000 putaran.
Dengan, d = 36,
S = K x n
Dan dengan,
K = πd
K = 3,14 x 36
K = 113,04 cm
Sehingga,
S = 113,04 x 51.000
S = 5.765.040 cm
S = 57,6504 km