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Video overview on https://howtomathe.de Two examples of how to calculate the area and circumference of a circle. Once with the formulas using the radius and then alternatively with the formulas that use the diameter directly. It doesn't matter which one you use, because radius and diameter can easily be converted into one another (radius = diameter / 2 and diameter = radius * 2). How the number pi (or π) or the formulas come about is not explained here, as that is a bit more extensive. It's about how to work with the formulas.