How To Calculate The Area Of A Circle A circle is the locus of a point which moves in a plane in such a way that its distance from a fixed point always remains same. The fixed point is called the centre and the given constant distance is known as the radius of the circle. The perimeter of a circle is known as its circumference. If r is the radius of a circle, then (i) … [Read more...] about How To Calculate The Area Of A Circle