Tuesday, November 22, 2011

Area of trapeziums & parallelograms

To work out the area of a trapezium:

Side a plus side b. Divide it by two and multiply it by the height. 

Side a+b is the average length of the entire shape. 

To work out the area of a parallelogram, multiply the base by the height.


  1. Great explanation and an easy step by step formula to follow. Thank you

  2. Well done, I understood the typed words in your blog, and learned something. However, isn't the working out in one of your pictures wrong?

  3. Well spotted Mr Grey! Can you spot the mistake guys?

  4. Didn't know how to find area of a trapezium - cool. To be honest, I've never tried, I teach Y6!
    Good stuff though.


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