Find the radius of a circular sector with angle 3π/2
and arc length 3 cm. I was not there when we did this in class, so I don' know what to do here at all.
Well you should have been class.
The length of an arc sub-tended by an angle of $\displaystyle \theta$ is $\displaystyle r\theta~.$
Well you should have been class.
The length of an arc sub-tended by an angle of $\displaystyle \theta$ is $\displaystyle r\theta~.$
Because the proportion of the circle's circumference being measured is $\displaystyle \displaystyle \frac{\theta}{2\pi}$, so the arc length is $\displaystyle \displaystyle \frac{\theta}{2\pi} \times 2\pi r = r\theta$