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.
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