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Lbawah foto = (2Pk/Lk - 1) x n
(ket.... n = sisa atas, kiri, Kanan
Pk = panjang karton
Lk = lebat karton)
= [(2 x 30)/20 - 1] x 2
= (60/20 - 20/20) x 2
= (40/20) x 2
= 4 cm,,