Use the formula for the particular figure
To find area of a circle using diameter, you use this formuler. Area=pi(diameter/2)(diameter/2)
The area of a circle is {pi} x radius2. 12 = 1, so: a circle of radius 1 unit has an area of exactly pi units2
Using 3.14 as Pi the area of circle is: 530.66
area of a circle is equal to pi times the square of its radius.. A=(pi)r^2
Use the formula for the particular figure
Figure the radius (r=C/2 pi) figure the area (A= pi x r squared). Note - the pi's don't cancel out.
Divide the irregular figure up into regular ones, and then add up the areas +++ You would use Pi (not "pie") only if the figure is a circle or other form based on circular properties.
The area of any circle = pi*radius2
To find area of a circle using diameter, you use this formuler. Area=pi(diameter/2)(diameter/2)
Pi is the number of times the diameter of a circle will fit into the circumference. Pi is not a circle, and does not have a circumference or area. To calculate a circumference USING pi, the circumference is diameter * pi. To find the area using pi, area = pi * radius * radius
This might be a bit of a cheap answer, but: Of all shapes, circles have the highest area/perimeter ratio; that is, they have a maximum area for a minimum perimeter. 1000 = circumference = 2 pi r r = about 159.155 m area = pi (r squared) = about 79577.538 sq. m using pi = 3.14159
Area of a circle = pi*radius2
Using 3.14 as Pi the area of circle is: 314.0
Using 3.14 as Pi the area of circle is: 0
pi times radius squared. :)
Figure out its radius and multiply it by pi or 3.14.