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a. diameter = 2r = 60 cm
b. keliling ban = π × d = 3,14 × 60 = 1884 cm
c. jarak yg ditempuh = 1884 × 100 = 188400 cm = 1,884 km
200,96=3,14.r2
R²=200,96/3,14
=64
R=8