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Oh yes.... the awkward one.  The Trapezium

Where will I see a trapezium?

Trapeziums can be used in a lot of design or architectural work.

Don't be put off by the awkward shape.  

The good news there is a formula to help us.

The bad news you have to learn it.

The confusing bit  a + b ÷ 2 x height.  This is the scary looking formula often given at the front of an exam paper.

The easy bit  the a and b just need to be substituted by number.  top + bottom ÷ 2 x height


 Area of this trapezium is 6 + 12 = 18  18 ÷ 2 = 9    9 x 8 = 72 cm²

This will soon become second nature.

Remember when working with area we always answer in units squared.

Now you could go barking up the wrong tree so be careful.

 When you are given measurements for a trapezium you are sometimes given the top, bottom, vertical height and a slanted height.  

You always want the vertical height as shown in the diagram above.


Once you have learned the formula you are flying.

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