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Sector of a circle 
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#1
Dec607, 06:56 PM

#2
Dec607, 07:20 PM

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You're on the right track.
You know the area of the entire circle; it's pi times the radius squared. You also know what fraction of that area is included in the sector; it's x/360, where x is in degrees.  Warren 


#3
Dec607, 07:26 PM

P: 5

Thanks for your help
But how would I work out the size of angle X. Would cos, sin or tan have to be used? 


#4
Dec607, 07:32 PM

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Sector of a circle
You know all three sides  use the law of cosines to find the angles.
 Warren 


#5
Dec707, 06:52 AM

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Less elegantly, you can break the triangle into two congruent righttriangles... then apply trigonometry with a righttriangle.



#6
Dec1607, 01:25 PM

P: 63

Are you sure that the area of the triangle is 27cm?



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