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23 = (5 + √2) × l
23 = 5 + √2l
l = 23 / (5 + √2)
l = 23 x (5 - √2 )/ (5 + √2) × (5 - √2)
l = 115 - 23 √2 / 23
l = 5 - √2
jadi lebar kebun adalah (5 - √2)m