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?
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If we use a scale factor of 1/5 to create a circle with a radius of 18 cm, the radius of the original circle can be found by dividing the radius of the dilated circle by the scale factor.
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 is 90 cm.