If you use a scale factor of 1/5 to create a circle with radius of 18 cm, what is the radius of the original circle you dilated?
The radius of the original circle can be found by multiplying the scale factor by the radius of the dilated circle.
Original Radius = (Scale Factor) x (Dilated Radius)
Original Radius = (1/5) x (18 cm)
Original Radius = 18 cm ÷ 5
Original Radius = 3.6 cm
Therefore, the radius of the original circle that was dilated using a scale factor of 1/5 is 3.6 cm.