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Diketahui: Dimater = 8 cm; r (1/2 d)= 4 cm
Luas= 22/7 x 16 cm= 50,3 cm-kuardat
Luas Lingkaran= 22/7 x 49 = 154 cm-kuadrat
B) 22/7 x 7 x 7 : 154