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550 = 2 ( p.15 + p.10 + 15.10 )
550 = 2 ( 15p + 10p + 150 )
550 = 2 ( 25p + 150 )
550 = 50p + 300
550 - 300 = 50p
250 = 50p
250/50 = p
5 cm = p
jadi panjangnya 5 cm
L : 2 x ((pxl ) + (p x t) + (l x t))
550 = 2 x (15 x 10 ) + (15 x t) + (10 x t)
550 = 2 (150 +15t +t)
550 = 2 (150 +25t)
550 = 300 + 50t
550-300 = 50t
250 = 50t
5= t