Area=pi times radius squared
Circumference=pi times diameter or pi times radius times two
Using 3.14 as Pi the area of circle is: 0
to calculate circumference you find a circles radius or diameter. you do diameter times pi or radius times 2 times pi. the you have circumference!
circumference = 2*pi*radius or pi*diameter
Pi is the number you get after finding the ratio of a circle's radius to its circumference. It's used in formulas to find the circumference and area of circles. The number goes on infinitely, but most people abbreviate the decimal to 3.14.
Radius = square root of (area/pi) Circumference = 2*pi*radius
Pi times the diameter of a circle gives its circumference.
Circumference of any circle = 2*pi*radius or pi*diameter
The circumference of a circle = pi*diametre = 2pi*radius
If you are talking about circles determine the radius by dividing the Area by pi and take the square root of the result. Then multiply the radius by two times pi.
Using 3.14 as Pi the area of circle is: 0
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
to calculate circumference you find a circles radius or diameter. you do diameter times pi or radius times 2 times pi. the you have circumference!
pi is an irrational number at 3.141592.... ( recur to infinity and decimals in no regular order. Let me tell you a story!!!! It was found by the 'Ancient Civilisations' that when a donkey is used to drive up water from well, it was tethered to a rope/halter, the radius. It walked round the well head tied to the halter. in a big circle, the circumference. It was found by the ancients, that twice the radius, the diamter, has a direct proportion to the circumference. It didn't how big/small the circumference was, compared to the radius/diameter the proportion always remained the same at 3.141592.... (pi). So the ancints constructed an equation. C is directly proportional to diameter ,d, This proportion is always constant hence a 'k' for constancy is inserted. C = kd or k = C/d This constant 'k' was given the name 'pi', which is the lower case Classical Greek letter 'p'. and stands for proportion. So ther you have it!!!!!
circumference = 2*pi*radius or pi*diameter
One definition of pi is the ratio of the circumference, C, of a circle to its diameter.,d. pi=C/d The area of a circle is (pi)r2 or (pi)d2/4 where r is the radius.
radius = circumference/(2*pi)area = pi*radius2So Area in terms of Circumference is A = pi [C/2pi]2or (circumference)2/4 pi
area=pi * r2 so divide the area by pi and take the sqrt to find the radius then circumference= 2 * pi * r