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panjang = 12
a. lebar ?
keliling = 2 (p+l)
44 = 2 ( 12+l)
44 = 24 + 2 l
44-24 = 2 l
20 = 2 l
10 = l
lebar persegi panjang 10cm
b. luas = p x l
= 12 x 10
= 120
luas persegi panjang adalah 120 cm2