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diketahui; yg kecil:
AB=20 (tinggi)
DE=15 (panjang)
yg besar (4 lebihnya: 2 di kanan dan 2 di kiri)
tinggi = 24
panjang = 19
luas jajargenjang = pxt
yg besar= 24x19 = 456
yg kecil = 20x15 = 300
selisihnya = 156