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K= 40 cm
K= 2(p + l)
40= 2(3 + 2)
40= 2(5)
40= 10
40/10= 4
Maka :
p= 3(4)
= 12
l= 2(4)
= 8
Jadi, panjang dan lebar suatu persegi panjang adalah 12 cm dan 8 cm.