Find the area of a sector of a circle of radius 3cm formed by an angle of 60 degrees. Round answer to two decimal places.
To find the area of a sector of a circle:
$\displaystyle \frac{\theta_{\deg}}{360} \cdot A$
Area of a circle is:
$\displaystyle A = \pi r^2$
If you want to do it using radians like Tom1234 suggested:
Here's how you convert from radians to degrees and vice versa:
$\displaystyle \frac{\theta_{\deg}}{180} = \frac{\theta_{\text{rad}}}{\pi}$
Then:
$\displaystyle \frac{\theta_{\text{rad}}}{2\pi} \cdot \pi r^2 = \frac{\theta_{\text{rad}}}{2}\cdot r^2 $