answersLogoWhite

0


Best Answer

'pi' is the constant of proportionality for ALL circles of whatever size. 'pi' has the values of 3.141592.... (to infinity). For school work pi = 3.14

For circle area A = pi r^2

circle circumference C = 2pi r = pi d

Volume of a sphere V = (4/3) pi r^3

Surface Area of a sphere SA = 4 pi r^2

The ancients before Classical Greece noticed that when an mule/donkey was tied to a centre pole (the radius) and was driven around the pole in a circle to drive up water (circumference) there was a constant ; pi = 3.14....

e.g. diameter 'd' = 2r = 10 and circumference = 31.4

Then C constant of proportionality d

Inserting the numbers

31.4 = constant X 10

constant = 31.4 / 10 = 3.14

This constant was named 'pi' ; the Classical Greek small case letter 'p', for proportionality. This constant held good for any circle of any size.

Hence we have C = pi d => C = 3.14 d further calculations gave us the Area as A = pi r^2 => A = 3.14 r^2

'pi' is an Irrational number. Casually this means the decimals go to infinity and there is no regular order in the digits. Your calculator may show pi = 3.141592654, but this is only an approximation. #

pi = 3.141592654...

Supa /dupa computers have calculated 'pi' to several billions of places and still going.

User Avatar

lenpollock

Lvl 15
1y ago
This answer is:
User Avatar
More answers
User Avatar

Wiki User

10y ago

The circumference of a circle is pi times the diameter.

The area of a circle is pi times the radius squared.

This answer is:
User Avatar

Add your answer:

Earn +20 pts
Q: What is the relationship between pi and circles?
Write your answer...
Submit
Still have questions?
magnify glass
imp
Related questions

What is thr relationship between pi and circles?

Circumference of a circle is 2 x Pi x the radius


What is the relationship between a circles circumference and it's radius?

C=2(pi)r


What is the relationship between the radius of a circle and the circumference?

any circles circumference divided by its diameter will equal pi, or 3.14159 approximately


What is the retationship between the circumference and the diameter?

What is the relationship between the circumference and the diameter? Answer The circumference divided by pi gives the diameter. d = C / pi An alternate way to express the above answer. For all circles, pi is the ratio of the circumference to the diameter pi = C / d


What is the relationship between the area of a circle and its radius squared?

The area of a circle is defined by the equation A = πr^2 where π = pi (3.14...) A = Area r^2 = radius squared So, the radius of a circle squared multiplied by pi equals the area.


What is Pi and who invented or discovered Pi?

Pi is the relationship between the diameter and the circumference of a circle.


What is the relationship between circumference and pi?

In any circle, the product of pi and the diameter will be the circumference. That is because pi is the ratio of the diameter of a circle to its circumference. Here is the equation: c = pi x d


What is the relationship between and pi?

pi X diameter = circumference of the circle.


What is the relationship between Pi and Circumfernece?

Pi X diameter equals circumference.


Is pi the relationship between the diameter and circumference of a circle?

yes, it is correct perimeter = d * pi pi is the ratio between the perimeter and the diameter


How can pi be used?

Pi (3.141...) is used for circles, and circles only. You use it to find the area and circumfrence.


What is the relationship between diamter and circumference?

circumference = pi*diameter or pi = circumference/diameter