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72°/360° × 22/7 × 20 × 20
= 1/5 × 22/7 × 20 × 20
= 1/1 × 22/7 × 5 × 20
= 314,285714
=1/5 x 22/7 x 20 x 20
= 22/7 x 80
=251,428571
atau bisa pakai 3,14 saja
=251,2