TES Maths ROTW: Areas of flags with circles

Craig Barton
08th February 2016

TES Maths Resource of the Week

Resource title: Areas of flags with circles

Resource author: Owen134866

What is it?

A couple of years ago, one of my favourite TES Maths authors created an areas of flags activity, which made use of the rectangles and triangles on flags from all corners of the globe. Due to public demand, he's back with a version including circles that is both brilliant and tricky. 

Including a PowerPoint presentation and worksheet, this resource encourages students to calculate the areas of given sections of the flags from countries such as Denmark, Macedonia and South Korea. The common factor? They all feature at least one circle.

How can it be used?

This is ideal as a stretch and challenge activity after a lesson on finding the area and circumference of circles. The first few questions are fairly straightforward but it's not long before pupils face much harder questions, such as this one about the Tunisian flag:

The star and the crescent take up one-third of the area of the circle, which has a radius of 6cm. The height to base ratio of the flag is 3:4. Work out the area of each separate colour. 

Luckily, the answers are provided! 

As well as giving students some extra practice of an important skill, the different context might just motivate and engage students more than usual.

Craig Barton

Craig is a secondary maths teacher in the North of England.

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