Answer:
b. 1/pi
Step-by-step explanation:
the circumference of a circle :
2pi×r
we have r1 (radius of the first circle) and r2 (radius of the second circle) .
2pi×r2 = 2pi×r1 + 2
r2 = (2pi×r1 + 2)/(2pi) = (pi×r1 + 1)/pi = r1 + 1/pi
so, we see r2 is 1/pi longer than r1.