Question

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Answer 1

Answer=44m.

One of the parallel sides of the trapezium is a =20m, let another parallel side be b, height h =15m.

$the \: given \: area \: of \: trapezium = 480m {}^{2} \\ area \: of \: a \: trapezium = \frac{1}{2} h(a + b) \\ so \: 480 = \frac{1}{2} \times 15 \times (20 + b)\\or \frac{480 \times 2}{15} = 20 + b \\ or \: 64 = 20 + b \: or \: b = 44m$

Hence the other parallel side of the trapezium is 44m

Answer 2

Answer : 44m

Area of Trap. = ½ h (a + b)

480 = ½ 15 (20 + b)

480 × 2/15 = 20 + b

64 = 20 + b

b = 64 - 20 = 44m