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p = 10cm
l = 5cm
Dit : t?
Jawab : 280 = 2 (10x5cm + 10cmxt + 5cmxt)
280 = 2 (50 + 10t + 5t)
280 = 100 + 20t + 10t
280 = 100 + 30t
280 - 100 = 30t
180 = 30t
= t
t = 6cm