Question

Horatio drew a circle with a radius of 6x cm. Kelli drew a circle with a radius of 18y cm. What is the scale factor between these two circles? (this is a quiz question, you will recieve a medal for best answer)
A. x/3y
B. 2x/3y
C. 1/3
D. 2/3

Answer 1

I believe the answer Is A.x/3y.

Answer 2

The scale factor of these two circles is the ratio of their radii. This is shown below,
                               sf = r1 / r2   =   6x/18y
Simplifying the fraction by dividing both the numerator and the denominator by 6 gives an answer of x/3y. Thus, the answer is letter A.