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luas permukaan tabung tanpa tutup = phi * r^2 + 2 * phi *r *t
Lp = 22/7 * 7 * 7 + 2 * 22/7 * 7 * 18
Lp = 154 + 792
Lp = 946 cm^2
untuk membuat 8 buah tempat pensil = 946*8 = 7568 cm^2
nomor 3
volume 1/2 bola = 1/2 * 4/3 * phi * r^3
V = 1/2 * 4/3 * 3,14 * 6^3
V = 452,16 cm^3