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Jawab :
P = 10 cm
L = 4 cm
L = P x L = 10 x 4 = 40 cm²
Maaf Kalau Salah :)
Keliling persegi panjang = 2(p+l)
keliling = 2(5x+2x) = 28 cm
= 2(7x) = 28
14x = 28
x =
x = 2
panjang: 5x = 5.2 = 10 cm
lebar: 2x = 2.2 = 4 cm
Luas persegi panjang = p.l
Luas = 10.4 = 40 cm