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Verified answer
7 ] Luas= π × r × r
= 22/7 × 3,5 m × 3,5 m
= 38,5 m2
8 ] Keliling roda
= π × d
= 22/7 × 182 cm
= 572 cm
= 0,00572 km
Banyak roda berputar
= 8,58 km : 0,00572 km
= 1.500 kali