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2 × Luas alas + keliling alas × tinggi tabung
2 × phi × r × r + phi × d × 28
2 × 314/100 × 10 × 10 + 314/100 × 20 × 28
628 + 62,8 × 28
1.104.275,2
Semoga membantu maaf jika salah
Lp=2×3,14×10×(10+28)
=62,8×38
=2386,4cm²