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## Homework Statement

Well basically i'm trying to learn trigonometry from a textbook. It shows a rule,

*to change from degrees to radians, multiply by pi/180.*

to change from radians to degrees, multiply by 180/pi .

to change from radians to degrees, multiply by 180/pi .

## Homework Equations

## The Attempt at a Solution

I'm the type of person that wants to know why what works. I cannot sleep when i cannot understand the background work of an rule. why do those rules work? ty