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rumus luas= 1/2 x ax t= 1/2 x 15 x t = 90 cm 2
t= luas : alas x 1/2
=90 cm2 : 15 x 1/2 = 3 cm
90 = 1/2 x 15 x tinggi
tinggi = 2 x90 / 15
= 12 cm