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Maka s=d=42m r=d÷2=42÷2=21
Kell taman=
42m + (1÷2×2πr)m + (1÷4×2πr)m=
42 + (1÷2×2×22÷7×21)m + (1÷4×2×22÷7×42)m =
42m + 66m + 66m = 141m
Biaya taman= 174m×30.000= Rp.5.220.000 (B)