Geometry
The circle
The circumference of every circle is a little more than three times its diameter: that number is called π. With it you work out the circumference and area of anything round.
What you need first
Why
How far does your bike go when the wheel turns all the way round once?
For a rectangle you simply add up the sides. A circle has no straight sides, so a ruler will not get you far.
Still, there is a fixed rule inside it. Whether you take a beer mat, a pizza or a wheel: the circumference is always about 3.14 times the diameter.
Opening Kaft Plus…
Kaft Plus
The rest of “The circle” is in Kaft Plus
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