[์ˆ˜ํ•™ I] ๋ถ€์ฑ„๊ผด ๊ณต์‹ (ํ˜ธ์˜ ๊ธธ์ด, ๋„“์ด)

Symbols & Definitions

$\theta$: ์ค‘์‹ฌ๊ฐ์˜ ํฌ๊ธฐ (rad)
$r$: ๋ฐ˜์ง€๋ฆ„
$l$: ํ˜ธ์˜ ๊ธธ์ด
$S$: ๋„“์ด

ํ˜ธ์˜ ๊ธธ์ด ๊ณต์‹

$l=r\theta$

๋ถ€์ฑ„๊ผด์˜ ๋„“์ด ๊ณต์‹

$S=\frac{1}{2}r^2\theta=\frac{1}{2}rl$

 

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