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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
The area of a circle with a diameter of 13 centimeters is: 132.7 cm2
The area of a circle with a 13 ft diameter is: 132.7 square feet.
The circle's area is about 13.45 square units.