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In a circle radius 10cm, an arc PQ subtends an angle of 5/12π radians at the centre of the circle. Calculate the radius of another circle whose circumference is equal to the length of arc PQ.   

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Length of Arc PQ = length of arc PQ   
                         =25/2π           
25/2π= 2πr  ∴ r = 25/2π × 1/2π      
                       =25/=6.25cm  

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