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To calculate the area of a trapezium: Identify the parallel sides 𝒂 and 𝒃, and the perpendicular height, 𝒉. Substitute the values of 𝒂, 𝒃 and 𝒉 into the formula.
A one-minute video showing you how to prove that the area of trapezium = sum of the parallel sides x height / 2.