1. Copyright Tim Morris/St Stephen's School Area of a Trapezium This is one in a series of Powerpoint slideshows to illustrate how to calculate the area of various 2-D shapes. Start with the Rectangle, then move onto the Parallelogram. After that select any of Triangle, Trapezium and Circle. Please feel free to copy and modify any of these slide shows, but make sure you acknowledge the author when doing so. www.mathxtc.com

2. Copyright Tim Morris/St Stephen's School T=top width TRAPEZIUM B=base width L=length H=height What is the area of this triangle? What is the area of this trapezium?

3. Copyright Tim Morris/St Stephen's School COPY THIS! L=length H=height TRAPEZIUM B=base width T=top width What is the area of this trapezium?

4. Copyright Tim Morris/St Stephen's School PASTE HERE! H=height L=length TRAPEZIUM B=base width T=top width What is the area of this trapezium?

5. Copyright Tim Morris/St Stephen's School H=height L=length FLIP VERTICALLY! TRAPEZIUM B=base width T=top width What is the area of this trapezium?

6. Copyright Tim Morris/St Stephen's School H=height L=length FLIP HORIZONTALLY! TRAPEZIUM B=base width T=top width What is the area of this trapezium?

7. Copyright Tim Morris/St Stephen's School H=height L=length TRANSLATE TO HERE! TRAPEZIUM B=base width T=top width What is the area of this trapezium?

8. Copyright Tim Morris/St Stephen's School H=height L=length CHECK MEASUREMENTS! TRAPEZIUM B=base width T=top width What is the area of this trapezium? T=top width

9. Copyright Tim Morris/St Stephen's School H=height L=length TRAPEZIUM B=base width T=top width Area of the trapezium is ½ the area of this parallelogram?

10. Copyright Tim Morris/St Stephen's School H=height TRAPEZIUM B=base width T=top width Area trapezium ½ (Base + Top) x Height

11. Copyright Tim Morris/St Stephen's School H=height TRAPEZIUM B=base width T=top width Area trapezium ½ (Base + Top) x Height