# Thread: Areas of a sector

1. ## Areas of a sector

Please note if I am incorrect

Question: There is a sector of a circle with centrepoint O. The radius of this circle is 23cm. The angle of the sector is 165 degrees. Work out the area of the sector correct to two significant figures.

I did $(\frac{\pi *23^2}{180})*165$

From which I got (thinking about the significant figs) 1500.

2. Hello, Mukilab!

Area of a sector: . $A \:=\:{\color{red}\tfrac{1}{2}}r^2\theta$

3. theta? What does that mean? I don't understand it outside of trigonometry.

Also what do you mean by twice the correct answer?

4. theta is the angle in radians