... it's time to look at our friend the trapezium (or trapezoid if you insist).
Can you turn this into a parallelogram? And how does it help work out the area?
Try it out, before clicking to see more. A teacher resource is also provided at the end of the post.
This is just too much fun!
Here's a teacher resource for use in class - first page gives no answers, second page gives a strong helping hand. A US version using the word 'trapezoid' instead of 'trapezium' is also provided.
Trapezium Exploration (Australia/British version)
Trapezoid Exploration (US version)