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46=2(p+l)
46/2=p+l
23=p+l
luas persegi panjang=pxl
126=pxl
lalu kuadratkan p+l
(p+l)²=p²+l²+2pl=(23)²
p²+l²+2(126)=529
p²+l²=529-252
p²+l²=277
setelah itu kita kuadratkan p-l
(p-l)²=p²+l²-2pl
(p-l)²=(277)-2(126)
(p-l)²=277-252
(p-l)²=25
p-l=5