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To calculate the area of a trapezium, you can use the formula:
Area = 1/2 * (a + b) * h
where a and b are the lengths of the parallel sides of the trapezium, and h is the height (perpendicular distance between the two parallel sides).
In this case:
a = 5.4 cm
b = 14.5 cm
h = 7.5 cm
Now, plug these values into the formula:
Area = 1/2 * (5.4 + 14.5) * 7.5
Area = 1/2 * 19.9 * 7.5
Area = 0.5 * 149.25
Area = 74.625 square cm
Therefore, the area of the trapezium is 74.625 square cm.