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)

2:1


3:1


1:2


1:3

Answer 1

Circumference ∝ radius. r_X = 12π/(2π) = 6, r_Z = 6π/(2π) = 3. So the scale factor from X to Z is 3:6 = 1:2.

Answer: 1:2