Question

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)

90 cm

9 m

3.6 cm

180 cm

Answer 1

90 cm

Explanation: With scale factor 1/5, image radius = (1/5) × original radius. So original = 18 ÷ (1/5) = 18 × 5 = 90 cm.