8. Find the area of canvas in t-shirt collar

The collar of a t-shirt is in the form of an isosceles trapezium whose parallel sides are 20 \(cm\) and 32 \(cm\) and the distance between them is 10 \(cm\). Find the area of the canvas that will be used to stitch the collar.

 

 

The area of canvas in a collar is  \(cm²\).