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46 = 2p+ 2l
23 = p+l
p = 23-l
luas = pxl
126 = (23-l)xl
l^2 -23l +126 = 0
l= 14 atau l= 9
karena l pasti lebih pendek dari panjang maka l=9 cm
p = 23-l
=23-9
= 14
selisih p-l
==== 14-9 =5