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Jari-jari bola = jari-jari tabung = 12 cm
tinggi tabung = 2 x 12 = 24 cm
Ditanya
Luas seluruh permukaan tabung
Rumus seluruh permukaan tabung
t tabung = 2xr = 2.12 = 24
Luas permukaan = 2πr (r+t)
= 2.π.12 (12+24)
= 2.π.12.36
= 864π (B)