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= 360°/6
= 60°
Jumlah sudut potongan lingkaran yg diarsir:
= 60 × 4
= 240°
L daerah yg diarsir:
= 240/360 × 22/7 × 10,5²
= 231 cm²
= 231/7x42/6
= 231/7x7
= 231cm2