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320 = (25+15) x t /2
640 = 40t
t=640/40
t = 16 cm
s1 = 25 cm
s2 = 15 cm
L = 320 cm²
Maka,
L = 1/2 x (jumlah sisi sejajar) x t
320 = 1/2 x (25 + 15) x t
320 = 1/2 x 40 x t
320 = 20t
t = 320 : 20
t = 16 cm
Jadi, tinggi trapesium tsb. adalah 16 cm