if you see a scale factor of 1/5 to create a circle with a radius of 18 cm, what is the radius of the original circle you dilated?
1. 3.6 cm.
2. 180 cm.
3. 90 cm.
4. 9 m.
To find the radius of the original circle, we need to multiply the radius of the dilated circle by the scale factor.
The scale factor is 1/5 and the radius of the dilated circle is 18 cm.
So, the radius of the original circle is 18 cm multiplied by 1/5:
18 cm * 1/5 = 3.6 cm.
Therefore, the correct answer is option 1: 3.6 cm.