The diameter of a circle was 4 cm and the diameter of the final circle was 36 cm. What is the scale factor?
The scale factor is defined as the ratio of the lengths of corresponding sides in two similar geometric figures. In this case, the diameter of the initial circle is 4 cm and the diameter of the final circle is 36 cm.
The scale factor can be found by dividing the length of the final circle by the length of the initial circle.
Scale factor = 36 cm / 4 cm = 9.
Therefore, the scale factor is 9.