If the sum of the circumferences of two circles with radii R1 and R2 is equal to the circumference of a circle of radius R, then


We are given that


Circumference of circle with radius R = Circumference of first circle with radius R1 + Circumference of second circle with radius R2


2πR = 2πR1+ 2πR2


R = R1+ R2


option A is correct.

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