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450 = (20 + 30) x t x 1/2
450 = 50 x t x 1/2
450 = 25 x t
450 : 25 = t
18 = t
jadi, tingginya adalah 18 cm
450=20+30/2×t
450=50/2×t
450=25×t
t=450/25
t=18