To find the radius of the original circle, you need to reverse the dilated scale factor.
If the scale factor used to dilate the circle is 1/5, the radius of the original circle would be:
Original radius = Dilated radius / Scale factor
Original radius = 18 cm / (1/5)
Original radius = 18 cm * (5/1)
Original radius = 90 cm
Therefore, the radius of the original circle you dilated is 90 cm.
scale drawings a quick check if you use a scale factor of 1/5 to create a circle with a radius 18 CM what is the radius of the original circle you dilated
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