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= 2 x 3,14 x 3
= 16,84 m/1684 cm
dik ; r = 3 m = 300 cm
dit kel ..atau garis putih ..
digunakan rumus kel yaitu 2.22/7.r
=2.22/7.300 cm
=44/7.300
=13.200/7
=188,571...... cm