If the circle has a RADIUS of 1mm then about 3,14 mm2
If the circle has a DIAMETER of 1mm then about 0,785 mm2
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A circle with a radius of 2.5 meters has an area of 19.63 square meters.
The circle's area is 314.159 cm2
The area of any circle is (pi) x (radius)2 .The area of half the circle is just half of that number.
The circumference of a circle whose area is 16 times the area of a circle whose diameter is 1.4m is: 17.6 cm
Circumference of a circle is (pi * diameter). Area of a circle is (pi * r2).