K = 102 cm
A + B + 20 + 9 + 16 + 24 + 12 = 102
A + B + 81 = 102
A + B = 102 - 81
A + B = 21 cm (D.)
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K = 102 cm
A + B + 20 + 9 + 16 + 24 + 12 = 102
A + B + 81 = 102
A + B = 102 - 81
A + B = 21 cm (D.)