Pnjang busur AB=sdt pust/360×K lingkaran
12,56 cm=sdt pustt/360×3,14×20
12,56×360=sdt pust×3,14×20
4521,6=62,8 sdt pusat
sudut puat=4521,6:62,8
=72
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Pnjang busur AB=sdt pust/360×K lingkaran
12,56 cm=sdt pustt/360×3,14×20
12,56×360=sdt pust×3,14×20
4521,6=62,8 sdt pusat
sudut puat=4521,6:62,8
=72