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304 cm2=1/2 × (13+25)×t
304 cm2=1/2 × 38 × t.
304 cm2=19×t
t=304:19 =16 cm
L = 1/2 x (13+25) x t
304 = 1/2 x 38 x t
t = 304 : (1/2 x 38)
t = 304 : 19
t = 16