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112 = 16 x (x+3) x 1/2
112 x 2 = 16 x (x+3)
224 = 16 x (x+3)
x + 3 = 224 : 16
x + 3 = 14
11 + 3 = 14 cm
maka QS = 11 + 3 = 14 cm