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tinggi A = 3
8 / 12 = 12 / x
8x = 144
x = 18 cm ( alas trapesium B )
8 / 12 = 3 / x
8x = 36
x = 4,5
Luas trapesium = jumlah sisi sejajar x tinggi x 1/2
(12 +18) x 4,5 x 1/2
= 67,5 cm2