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64 = 2.(p+l)
64 = 2.(22+l)
64:2 = 22+l
32 = 22+l
l = 32-22
l = 10 cm
64 = 2(22+l)
64 = 44 + 2l
64-44 = 2l
20 = 2l
20/2 = l
10 = l
jadi lebar persegipanjang adalah 10 cm