Mammoth Memory

Alternative to remember area and circumference of a circle

Many people can actually remember either:

`pir^2` or `2pir`

But need a nudge to remind them which is area and which is circumference.

To remember which is which:

Just remember `r^2`  must be an area

And a single `r` must be a line


`\pir^2`  = Area

`2\pir`  = The line of the circumference

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