A circle with a radius of 2 units has an area of 12.57 square units.
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Diameter of circle = 2 * Radius of the circle.
The radius of a circle is always 1/2 its diameter.
Area of a circle = pi*radius2 Circumference of a circle = 2*pi*radius or diameter*pi Diameter of a circle = 2*radius
The radius of a circle is half the diameter, so if the circle has a diameter of 2 cm, the radius would be 1 cm.
The radius (radii) of a circle is 1/2 of the diameter. The radius of a circle with a 6.2 cm diameter is 3.1 cm.