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Luas permukaan = 2πr(r+t)
= 2×3.14×10(20+10)
= 6,28×10×30
= 1.884 cm²
Mohon hitungannya dicek ulang/dihitung ulang/kalkulator takutnya salah angka..kalo carany sih udah bener sprti itu #semogamembantutuhasmu