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p = 5a
l = a
Cari nilai a :
K pp = 2 ( p + l )
84 = 2 ( 5a + a )
42 = 6a
a = 7 cm
Sehingga, luas persegi panjang :
L pp = 5 × L p
= 5s²
= 5 (7 cm)²
= 5 × 49 cm²
= 245 cm²