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 point)
• 9 m
• 3.6 cm
• 90 cm
© 180 cm
The correct answer is: 90 cm
To find the radius of the original circle, you need to divide the dilated circle's radius by the scale factor (1/5).
18 cm / 1/5 = 18 cm x 5 = 90 cm
Therefore, the radius of the original circle is 90 cm.