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320= (23+17)x t x 1/2
640 = 40t
640/40 = t
t= 16cm
320 = (23 + 17) x t x 1/2
320 = 40 x t x 1/2
320 = 20t
320 : 20 = t
16 = t
maka tinggi = t = 16 cm