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?
1.90 cm
2.180 cm
3.9 m
4.3.6 cm
The radius of the original circle can be found by multiplying the scale factor by the radius of the dilated circle.
Scale factor = 1/5
Radius of dilated circle = 18 cm
Radius of original circle = (Scale factor) * (Radius of dilated circle)
= (1/5) * 18 cm
= 3.6 cm
Therefore, the radius of the original circle is 3.6 cm. Hence, the correct option is 4.3.6 cm.