Jawapan

2016-10-03T18:23:21+08:00
Lilitan;
= 2 \pi j
= 2 × 22/7 × 21
= 132 cm

Tukarkn kpd m;
= 132/100
= 1.32 m

Selepas 20 pusingan lengkap;
= 1.32 × 20
= 26.4 m  #
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