The radii of the two circles are 19cm and 9cm respectively. Find the radius of the circle which has circumference equal to the sum of the circumferences of the two circles.
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Solution
Let r1 and C1 be the radius and circumference, respectively of 1st circle and r2 and C2 be the radius and circumference, respectively of 2nd circle.
Let r3 and C3 be the radius and circumference, respectively of the required circle.