bigger base + smaller base x height/2
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area of trapezium=1/2{a+b}h
The area of a trapezium is given by 0.5*(a+b)*h where a and b are the lengths of the parallel sides and h is the vertical distance between them. The fact that the trapezium is isosceles does not matter. A trapezium is a 2 dimensional object and so it has no volume.
1/2 h(a+b)
In UK terms:- Area = 0.5*(sum of parallel sides)*height and measured in square units
A trapezium has a pair of parallel sides of different lengths so in order to find its 2nd parallel side the information given must include its height.