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AG = 16
AD = 8
AB = 12
DC = 6
ditanya : luas trapesium yg besar
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mencari sisi-sisinya : (dengan perbandingan)
GF = 16 × 6 / 8 = 12 cm
AE = 16 × 12 / 8 = 24 cm
luas = (12 + 24) × 16 / 2 = 36 × 8 = 288 cm2.
...(D.)...
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