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luas trapesium = 1/2 x (alas+atas) x tinggi = 1/2 x (28+10) x 12 = 228
luas total = 328 cm^2
tinggi trapesium didapat dari 28-10 = 18, lalu dibagi 2 = 9
Pakai phytagoras
tinggi = akar 15^2 - 9^2 = akar 225 - 81 = akar 144 = 12