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.