(area of trapezium) Area=
70 cm²=17+11 x
2

x = 5

Step-by-step explanation:

The area (A) of a trapezium is calculated as

A = h(a + b)

where h is the perpendicular height and a, b the parallel bases

Here A = 70, h = x, a = 17 and b = 11, thus

x(17 + 11) = 70

Multiply both sides by 2 to clear the fraction

28x = 140 ( divide both sides by 28 )

x = 5

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