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.
Length of Arc PQ = =25/2π 25/2π= 2πr ∴ r = 25/2π × 1/2π =25/4 =6.25cm
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