The sides of the trapezium are \(AB \ =\) 12 \(cm\), \(BC \ =\) 13 \(cm\), \(CD \ =\) 26 \(cm\) and \(AD \ =\) 15 \(cm\). Find the area of the trapezium.
 
ABCD_trapezium.png
 
Area of the trapezium \(=\)  \(cm^2\) 
 
[Note: Round off your answer to two decimal places]