The diameter of a circle was

12
12 cm and the diameter of the final circle was
5.4
5.4 cm. What is the scale factor?

1 answer

To find the scale factor between two circles based on their diameters, you can divide the diameter of the final circle by the diameter of the original circle.

Given:

  • Diameter of the original circle = 12 cm
  • Diameter of the final circle = 5.4 cm

The scale factor is calculated as follows:

\[ \text{Scale Factor} = \frac{\text{Diameter of Final Circle}}{\text{Diameter of Original Circle}} = \frac{5.4 , \text{cm}}{12 , \text{cm}} \]

Calculating this:

\[ \text{Scale Factor} = \frac{5.4}{12} = 0.45 \]

So, the scale factor is 0.45.