Question

If you use a scale factor of 1/5 to create a circle with radius 18 cm, what is the radius of the original circle you dilated.

Answer 1

To find the radius of the original circle, we need to undo the dilation. Since the scale factor is 1/5, it means that each dimension (radius) of the original circle has been divided by 1/5. Thus, the radius of the original circle can be found by multiplying the given radius of the dilated circle by 1/5:

Radius of original circle = (1/5) * 18 cm = 3.6 cm