ABCD is a trapezium with AB || CD and ∠BCD = 2 ∠DAB. If DC = a and BC = b, the length of AB in terms of a and b is
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The lenght of AB in terms of a and b is ( a + b/ √2).
area of trapezium is [1 / 2 {some of the parallel side} {distance between them}]
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