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p = 12 cm
t = 4 cm
Lp = 352 cm
mka:
Lp = 2 x (pxl + pxt + lxt)
352 = 2 x (12l + 12x4 + 4l)
352 = 2 x (16l + 48)
352 = 32l + 96
32l = 352 - 96
l = 256/32
l = 8 cm
jdi lebarny adalah 8 cm