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2(p+l) = 52
p+l = 26
panjang 6 lebih dari lebarnya berarti :
p = 6+l
p-l = 6
ELIMINASI
p+l = 26
p-l = 6
_______ _
2l = 20
l = 10 cm
SUBSTITUSI
p+l = 26
p+10= 26
p = 16 cm
Luas persegi panjang = p x l
= 16 x 10
= 160 cm² (D)