First you have to work out the diameter of the circle.

The radius of this circle is 8cm. To figure out the diameter, we times the radius by 2.
8 times 2 is 16cm. The diameter of this circle is 16cm. To figure out the area, you times the diameter by π. This symbol means pi. Pi equals 3.14, so we times the diameter (16cm) by pi (3.14), so thats 16 times 3.14. This equals 50.24, so the area of this circle is 50.24squared.
Hi, I'm Ben from Waikowhai Primary School. I liked how you explained how to find the radius of a circle very simply. I never knew this before looking at this blog post. If you want to check out my blog it is at: http://wpsbenl.blogspot.co.nz/
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