Radian, yoy va sektor

Radian

Burchakning radian o'lchovi — uning yoyi uzunligining radiusga nisbati. Yoyi radiusga teng bo'lgan burchak $1$ radian.

To'liq aylana yoyi $2\pi r$, shuning uchun to'liq burchak $2\pi$ radian:

$\pi \text{ rad} = 180^\circ \qquad 1 \text{ rad} = \frac{180^\circ}{\pi} \approx 57{,}3^\circ$