could someone please help me understand how to find the area of a sector of a circle with a 40degree angle?? !!!!!!!!!!!!!!!!!!!!!!!!!!!!

Question

mathmate · Answer

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Since a circle has 360 deg. at the centre, the area of the sector is (40/360)*pi*r^2

anonymous · Answer

thanks, but is that just an equation for all problems like this or ????

mathmate · Answer

Yes, you can do it the same way for other angles.  Substitute 40 deg. by the new angle.  The drawing should give a good idea why this works.

anonymous · Answer

so would the answer to the problem above be 8.72cmsq

mathmate · Answer

It's possible, but I don't know the radius.

anonymous · Answer

5cm

mathmate · Answer

Yes, that what I got too!

anonymous · Answer

awesome! okay so 1 more problem, errrg math|dw:1346380845692:dw|