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L.permukaan= 2 (pxl + pxt + lxt)
1300 = 2 ( 15xl + 15x20 + l x 20)
1300 = 2 ( 15l + 300 + 20l)
1300 = 2 ( 25l + 300)
1300 = 50l + 600
1300-600= 50l
700 = 50l
700/50 = l
70/5 = l
14 = l
jawabnnya adalah 14 cm