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## Answers

**The quadrilateral you were talking about is Trapezoid/Trapezium**

**Click image for proof.**

So the formula of finding the area on trapezium in

1/2 *height*[sum of the lengths of the parallel sides]

So to find height use the Pythagoras theorem to get AF(given in my rough digram)

AF = 10.5

So the height is 10.5

Then,put the values

1÷2×10.5×(9+12)

=110.25 cm^2