keliling buku = 76 cm panjang buku = 23 cm lebar buku = .......cm

keliling persegi panjang= 2(p+l)
76= 2(23+l)
38= 23 + l
15 cm = l

kll = 2 (p+l)
76 = 2 (23 + l )
76 / 2 = 23 + l
38 = 23 + l
l = 38 - 23
l = 15