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L2 = 3,14 x 0,25 x 0,25 x 16 = 3,14
L1 - L2 = 100 - 3,14 = 96,86
= 100
Luas 16 lingkaran = 16 X 22/7 x 1/4 x 1/4
= 3.14
Luas permukaan yang tidak ada lubangnya:
100 - 3.14 = 96,86