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b. luas kaca (bingkai dalam) = p x l = 45 x 30 = 1250
5. lebar foto = 50 - 5(2) = 40
a.
sisa karton bag.bawah = 90 - (72+5) = 90 - 77 = 13
b. luas karton yg tidak ditutupi foto = L.karton - L.foto = 4500 - 2880 = 1620
cb diteliti lagi angka2nya