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280 = 1/2 x ( 14 + 26) x t
280 = 1/2 x 40 x t
280 = 20 x t
280 : 20 = t
14 =t
keterangan :
a = sisi sejajar trapesium 14cm
b = sisi sejajar trapesium 26cm
t = tinggi trapesium
L = Luas trapesium