Mammoth Memory

Radians and the good news

The good news is you don’t have to remember

1 radian `=57.296^@`

Because it is so easy to work out what the degrees are.

The circumference of a circle is 2?r which is an equivalent measure of 360 degrees

So if:

`360^@=100%` of circle 



 (Look at our section on percentages)

`(2pir)/r` `=` `360/x`
`x` `=` `(360timesr)/(2pir)`
`x` `=` `(360times cancelr)/(2pi cancelr)`
`x` `=` `360/(2pi)`
`x` `=` `57.296^@`


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