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= 1/4π d kuadrat × 22/7× 56×56 dikurangi 1/4 π d`× 21/7 × 28× 28
= 9856/4 - 2464/4
= 2464 - 616
= 3.080 × Rp. 6000.00/m kubik
= Rp. 18. 480.00 / m kubik
oh ya lain kali kalau ksih poin yg banyak 100 kek atau 85 jgn 10
ksihan ug nulis cpek klau hrs nulis sbnyak itu.......