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a = ?
b = 8 1/3 cm = 25/3 cm
L= 2a +2b
36 5/6 = 2 x 25 /3 + 2a
36 5/6 = 50 /3 + 2a
36 5/6 - 100/6 = 2a
36 5/6 - 16 4/6 = 2a
20 1/6 = 2a
a = 10 1/12