## Trigonometry 7th Edition

We know that if point $P$ is a point on a circle of radius $r$, and $P$ moves in a distance $s$ on the circumference of the circle in an amount of time $t$, then the linear velocity, $v$, of $P$ is calculated as $v=\frac{s}{t}$. We are given that $s=12$ cm and $t=2$ sec. Therefore, $v=\frac{12cm}{2sec}=\frac{12cm\div2}{2sec\div2}=\frac{6cm}{1sec}=6$ cm/sec.