What is the formula for finding the volume of a trapezium?

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SUMMARY

The formula for finding the volume of a trapezium is defined as Volume = height * (top area + bottom area) / 2. This formula assumes that the trapezium is a three-dimensional figure with parallel top and bottom surfaces and planar sides. The expression (top area + bottom area) / 2 represents the average base area, which is applicable due to the linear nature of the planar sides.

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Volume of a trapezium = height * (top area +botton area)/2
 
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Assuming that by "trapezium" you mean "a three dimensional figure having parallel top and bottom and planar sides", yes. Basically, '(top area+ bottom area)/2' is the "average" base area. As long as you have linear formulas (and since you have planar sides, this is linear) you can calculate an average like that.
 

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