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1288 = 1/2 x 28 x (52+a)
1288 = 14 x (52+a)
52 + a = 1288/14
52 + a = 92
a = 92 - 52 = 40 cm
Luas trapesium = {(a + b) x t } / 2
1288 = { (52 + b) x 28 } / 2
2576 = 1456 + 28 x
1120 = 28 x
40 = x