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190 = 21 + 17 x t
2
190 = 38 x t
2
38 x t = 190 x 2
38t = 380
t = 10cm
Jadi tingginya = 10cm
a = 17 cm
b = 21 cm
L = 1/2 × (a + b) × t
190 = 1/2 × (17 + 21) × t
190 = 1/2 × 38 × t
190 = 19t
10 = t
Jadi tinggi trapesium tersebut adalah 10 cm.