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Kelas 9Matematika
Bab 2 - Bangun Ruang Sisi Lengkung
step 1 : menentukan jari jari
L = 2 π r t
528 = 2 x 22/7 x r x 12
r = 528 ÷ (2 x 22/7 x 12)
r = 7 cm
step 2 : menentukan volume tabung
v = π r² t
v = 22/7 x 7² x 12
v = 1848 cm³