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52 = 2 ( 8a + 5a )
26 = 13a
a = 2
Sehingga,
L = p × l
= 8a × 5a
= 8 × 2 × 5 × 2
= 160 cm² ==>(a.)
p = 8y
l = 5y
K = 2(p + l)
52 = 2(8y + 5y)
26 = 8y + 5y
26 = 13y
2 = y
p = 8y
= 8(2)
= 16 cm
l = 5y
= 5(2)
= 10 cm
L = p × l
= 16 cm × 10 cm
= 160 cm²
Jadi luas persegi panjang tersebut adalah 160 cm² (A).