Areas of a sector

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• Jan 5th 2010, 09:46 AM
Mukilab
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.
• Jan 5th 2010, 10:02 AM
Soroban
Hello, Mukilab!

Your answer is twice the correct answer.

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

• Jan 5th 2010, 11:14 AM
Mukilab
theta? What does that mean? I don't understand it outside of trigonometry.

Also what do you mean by twice the correct answer?
• Jan 5th 2010, 11:58 AM
vonflex1
theta is the angle in radians