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4 * pi = 12.566370614359172953850573533118

But just round it off to 12.57 unless otherwise directed.

pi = 3.142... It is a mathematical constant sometimes approximated as 22/7 but if your calculator has a pi function, use it. On my calculator i would type (4) (*) (pi) (=)

Pi looks like a squiggly line ~ with two curved lines beneath it, if you are not sure what it is.

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12.56

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Q: What is the circumference of a circle if the diameter is 4?
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