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Here are the three circle equations, in words and equations.
Circumfwerence - pi X diameter
C = pi d
Circumference = two X pi X radius
C = 2pi r
Area = pi X radius squared
A = pi r^(2)
NB It is only the radial value that is squared ; NOT 'pi'.
NB pi is a constant at 3.141592..., usually approximated to 3.14 or 3.1416.
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How do you find circumference if you know diameter?
If you know the diameter and need the circumference you times the diameter of the circle by 3.14 also known as pie. That is how you get the circumference by only knowing the diameter. :)
What is relation between pie and circle?
It is pi, a letter in the Greek alphabet, and pronounced like pie. This infinite value, usually expressed as 3.14 or sometimes more accurately as 3.1416 is the ratio of the diameter (distance across) a circle, and the circumference (distance around) a circle. The diameter times pi equals the circumference, and the circumference divided by pi gives the diameter. Also, the radius (half the diameter) times itself and then multiplied by pi gives the area inside a circle. The value of pi is the same regardless of the size of a circle.
Why is the circumference of a circle diameter times pi or 2 radius times pi?
Because 2 times the radius is equal to the diameter of the circle
What is the ratio of circumference of a circle to it's diameter?
The circumference of a circle equals pi times the diameter.
What is the circumference of a circle with a 25ft diameter?
Pi is, by definition, the ratio of a circle's circumference to its diameter. It follows that the circumference of any circle is pi times its diameter.
