human
Given the area of a trapezium, calculate a missing dimension The area of this trapezium is \( 40 \mathrm{~cm}^{2} \).

What is the value of \( a \) ? ![A trapezium with the parallel sides labelled with 2cm and a and the height labelled with 8cm]() \( 3 \mathrm{~cm} \)
gpt
Does not divide by 2 when calculating the area of a trapezium