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= 2πr
= 2 × 22/7 × 70 m
= 440 m
Banyak lampu yang dipasang
= 440 m/10 m × 1 buah
= 44 buah
Jawaban: B
= 2 . 22/7 . 70
= 440 m
Banyak lampu = keliling / jarak
= 440 / 10
= 44
Jadi, banyaknya lampu yang dibutuhkan adalah 44