Thursday 10 July 2014

CIRCLES 2

Find the value of y in the figure below if O is the centre of the circle. [diagram not to scale]


Solution

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

= 2 x (y)

=2y

Angle 2y and 7y are opposite angles. They add up to 3600.

Therefore 
2y + 7y = 3600

9y = 3600

9y = 3600 
9         9 

y = 40        

Hence y = 40        

TRY THIS………….


Find the value of y in the figure below if O is the centre of the circle. [diagram not to scale]



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