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Verified answer
Keliling = phi x dKeliling = 3,14 x 50
Keliling = 157 cm
157 x 400 = 62800 cm.
= 400 x Keliling roda
= 400 x 2.π.r
= 400 x 2 x 3,14 x 50
= 400 x 314
= 125.600 cm
= 1.256 m
= 1,256 km