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misalkan tinggi = t
mencari tinggi, pake phytagoras aja. jadi 18^2 = 9^2 (alasnya kan dibagi 2) + t^2
324 - 81 = t^2
jadi t = akar 243 = sekitar 15,6
jadi luasnya 1/2 x 18 (alas) x 15,6 (tinggi) = 140,4