Question

If the circumference of circle X
is 12π
and the circumference of circle Z
is 6π
, then what is the scale factor from X
to Z
?(1 point)

1:3


1:2


3:1


2:1

Answer 1

1:2

Reason: Circumference is proportional to the radius (C = 2πr). So the scale factor from X to Z is 6π / 12π = 1/2 (or 1:2).