I'm just wondering because I'm really confused right now.(adsbygoogle = window.adsbygoogle || []).push({});

My teacher gave us the formula:

[itex]K= \frac{1}{2}sr[/itex]

for area of a given sector where "s" is the arc length and "r" is the given radius.

the formula for the arc length is:

[itex]s=\Theta r[/itex]

Though, I can't seem to understand how he came up with the formula for the area of the sector, because searching the internet always came with the result that the formula for area of the sector is:

[itex] A= \frac{\Theta}{360} \pi r^2[/itex]

I hope someone can help me. :)

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# Sector Area and Arc Length

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