Tuesday 14 January 2014

CIRCLES B5

Find y in the figure below, O is the center of the circle;



solution


Angle at the centre = 2 x (angle at the circumference)

= 2 x (5y)

= 10y

Angle 10y and 2y are opposite angles.

Therefore 10y + 2y = 360

12y = 360

12y = 360 
12         12 

y = 30        


Hence y = 30        

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