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jadi luas persegi panjang adalah 40 cm
rumus keliling persegi
2 (p + l)= 80cm
2 (2l + l) = 80
6l = 80...L= 80/6
l= 40/3
p= 2 x 40/3 = 80/3
luas = p x l
80/3 x 40/3 = 3.200 / 9= 355,55 cm2