# Area of a Trapezium finding and comparing

- Author:
- Morton Betts

First can you work out the formula for the area of a trapezium?
Rotate out a second trapezium for a clue.
Compare the shape to the formula for a parallelogram.
Check your answer with the "show area formula" box.
Second can you change the shape (using the 3 blue corner dots and the height dot) to make other shapes?
See if you can find a rhombus, parallelogram, rectangle, square and any tyoe of triangle.
How does the formula change for the different shapes? Look at the values for a and b on the shape and in the formula.
Use the rotate slider to see that it's still always a parallelogram.