In a circle radius 10cm, an arc PQ subtends an angle of ^{5}/_{12}π 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}/_{2}π ^{25}/_{2}π= 2πr ∴ r =^{ 25}/_{2}π × ^{1}/_{2}π =^{25}/_{4 }=6.25cm

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