How to calculate the area and outline of a circle

In this videotutorial we wanne show you how easy it is to calculate the area and the outline / circumference of a circle. You will get an idea about round up and down of numbers and whats Pi, radius and a diameter.

Be sure, it is far easier than you might think!

This is one of our fist videotutorials in english, so bear with us 🙂

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