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panjang =L+ 5 cm
keliling = 2 (panjang+L)
90= 2 (L+ 5+ L)
90= 2 (5+ 2L)
90= 10+ 4L
4L= 90-10
4L= 80
L= 80 : 4 = 20cm
90 = 2 × ( 5 + l )
90 = 10 + 2 l
90 - 10 = 2 l
80 = 2 l
80 : 2 = l
40 = l