It is: pi*352 = 3848.451 square km to 3 decimal places
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A circle with a radius of 0.9 km has an area of 2.54 square km
Using 3.14 as Pi the area of circle is: 2.5434
A circle with a radius of 1.8 km has a circumference of 11.31 km
radius = 48/2 = 24 km
Using 3.14 as Pi the area of circle is: 615.44