The radius is half of the diameter. So, the radius of the aorta is given by:
\[ r = \frac{d}{2} = \frac{1.8 \, \text{cm}}{2} = 0.9 \, \text{cm} \]
But we need the radius in meters, so we convert it as follows:
\[ r = 0.9 \, \text{cm} \times \frac{1 \,
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