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.

2