Enter the radius, enter the calculation accuracy and click on "Calculate". The calculator will calculate the area of a circle.
Calculator of the circle perimeter
Calculator
Circle - a geometric figure bounded by a circle. In other words, the circle - this is the set of all points in the plane whose distance to a given point (the center circle) does not exceed a predetermined distance (radius). The circumference of a circle is the limit.
Circle - a centrally symmetric figure.
When you rotate the plane of the center of the circle moves in on itself.
The circle is the convex figure.
The area of a circle is called the area of the figure bounded range. Calculated by the formula: 
The circle is a figure that has the largest area for a given perimeter. Or equivalently, which has the smallest perimeter for a given area.