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= 5×4/2
=20/2=10 cm
panjang : lebar = 5 : 2
jika lebar = 4 cm
maka,
p/l = p/l
5/2 = p/4
panjang = 10 cm
luas persegi panjang adalah
panjang x lebar
= 10 x 4 = 40 cm*2
keliling persegi panjang
= 2 (p+l)
= 2 (10+4)
= 2 (14)
= 28 cm