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Verified answer
Dik.d=21 m
jarak antar lampu=3 m
dit. banyak lampu?
banyak lampu = keliling : jarak antar lampu
=π.d : jarak antar lampu
=22/7. 21 : 3
=66 : 3
=22 buah lampu
= π D
= 22/7 × 21
= 66 m
Banyaknya lampu huas yg di pasang
= 66 : 3
= 22 lampu