(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

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 .

2. Relevant equations

3. 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

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# Very basic trigonometry question?

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