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Question Number 25148 by adityapratap2585@gmail.com last updated on 05/Dec/17
difference between degree and radian.
$$\mathrm{difference}\:\mathrm{between}\:\mathrm{degree}\:\mathrm{and}\:\mathrm{radian}. \\ $$
Commented by prakash jain last updated on 05/Dec/17
radian is measured as radio of arc  length to radius.  for a semicircle arc length=πr  so a semicircle subtends ((πr)/r)=π radians  at the center.  So π radians=180°.
$$\mathrm{radian}\:\mathrm{is}\:\mathrm{measured}\:\mathrm{as}\:\mathrm{radio}\:\mathrm{of}\:\mathrm{arc} \\ $$$$\mathrm{length}\:\mathrm{to}\:\mathrm{radius}. \\ $$$$\mathrm{for}\:\mathrm{a}\:\mathrm{semicircle}\:\mathrm{arc}\:\mathrm{length}=\pi{r} \\ $$$$\mathrm{so}\:\mathrm{a}\:\mathrm{semicircle}\:\mathrm{subtends}\:\frac{\pi{r}}{{r}}=\pi\:\mathrm{radians} \\ $$$$\mathrm{at}\:\mathrm{the}\:\mathrm{center}. \\ $$$$\mathrm{So}\:\pi\:\mathrm{radians}=\mathrm{180}°. \\ $$

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