Half the diameter then multiply the radius (your new measurement) by itself.
E.g
Diameter is 10 what is the area? 10 divided by 2 is 5 which is the radius. Multiply the 5 by itself. 52=25 then multiply the squared radius (25) by Pi.
circumference = pi*40cm
The formula to find the area of a circle is pi x the radius squared.
The formula to find area is you do the radius squared times pi or 3.14
By using the formula: area of circle = pi*radius2
The area of a circle = Pi*r2 where r is the radius and Pi is approximately equal to 3.14.
In order to find the diameter of a circle if you have the area is to rearrange the formula for the area of a circle to put diameter as the unknown, like so: PIE*d = Area of a Circle d = (Area of a Circle) / PIE Therefore if the area of your circle is 40cm, 40/PIE = 12.73cm and that's the diameter.
The formula to find the area of a circle is: A = pi * r2
The area of a circle can be found with the formula (pi)r^2
Area of a circle = pi*radius2
circumference = pi*40cm
The formula to find the area of a circle is pi x the radius squared.
when trying to find squ. feet you have to find the area. the area of a circle is half of the diameter squared times pi half of the diamter is the radius therefore the area in squ. ft would be.. A = pi x r2
The formula to find area is you do the radius squared times pi or 3.14
The formula depends on the information available to you.
By using the formula: area of circle = pi*radius2
The radius of a circle is the distance from the center to any point on the circle. The area is the space within the circle. The formula to find the area is πr2. r stands for the radius of the circle. If you want to find the radius, you can work backwards from the area or the circumference, which is the perimeter of the circle. The formula for circumference is 2πr.
a formula is alway correct