Area of circle = PI * R2
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By dividing the diameter by 2 will give the circle's radius. Area of any circle = pi*radius squared.
It is: (pi*radius2)/4
The area sector of a circle needs pi to work it out.
Yes. That is often how pie charts work.
The area of a circle is the number of square units inside that circle, if each square in the circle to the left has an area of 1cm2, you could count the total number of squares to get the area of this circle. However, it is easier to use one the following formulas; A=.r²or A=pi times r times r, where A is the area and r is the radius.