Register to reply 
Sector of a circle 
Share this thread: 
#1
Dec607, 06:56 PM

#2
Dec607, 07:20 PM

Emeritus
Sci Advisor
PF Gold
P: 10,427

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

Emeritus
Sci Advisor
PF Gold
P: 10,427

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


#5
Dec707, 06:52 AM

Sci Advisor
HW Helper
PF Gold
P: 4,139

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



#6
Dec1607, 01:25 PM

P: 62

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



Register to reply 
Related Discussions  
Area of a sector of a circle  Calculus & Beyond Homework  9  
Private sector or academia  Academic Guidance  1  
'Private Sector' Hiring!  Academic Guidance  9  
Physics in the private sector  Academic Guidance  3  
Exactly Soluble sector of Quantum Gravity?  Beyond the Standard Model  0 