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48 = 2 (2x + x)
48 = 6x
x = 48/6
x = 8
panjang = 2x = 2(8) = 16 cm
p = 2×l
misalkan l = 8
maka p = 16
pembuktian :
2×(16+8) = 2×24 = 48
jadi, panjang = 16 cm