To find the radius of the original circle before dilation, we need to divide the radius of the dilated circle by the scale factor.
Given:
- Scale factor = 15
- Radius of the dilated circle = 18 cm
To find the radius of the original circle:
\[ \text{Radius of original circle} = \frac{\text{Radius of dilated circle}}{\text{Scale factor}} = \frac{18 \text{ cm}}{15} = 1.2 \text{ cm} \]
Since 1.2 cm is not among your provided options, please double-check the problem or the possible responses.
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