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 28 \(cm\) and 38 \(cm\) and the distance between them is 12 \(cm\). Find the area of the canvas that will be used to stitch the collar.

 

 

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