Disk: area and circumference
Common calculations related to disk (wheel, circle). Calculate circle's area or radius or circumference.

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# What do you want to calculate today?

 Choose a scenario that best fits your needs I know radius and want to calculate area and circumference.I know circumference and want to calculate radius and area.I know area and want to calculate radius and circumference.

# Calculations data - enter values, that you know here

 Circumference (L) => Area (S) => Radius (R) <=

# Result: Circumference (L)

Used formulaL = 2pi * R
Result2pi
Numerical result6.2832
Result step by step
 1 2 pi * 1 Collected and combined like terms 2 2 pi Result
Numerical result step by step
 1 2 * 3.141592653589793 Simplify arithmetic 2 6.2832 Result

# Result: Area (S)

Used formulaS = pi * R^2
Resultpi
Numerical result3.141592653589793
Result step by step
 1 pi * 1 ^ 2 Simplify arithmetic 2 pi * 1 Rearrange coefficents 3 pi Result
Numerical result step by step
 1 3.14159 Result

# Some facts

• The disk (wheel) is a set of points on the plane whose distance from the center of the disk is less or equal to its radius.
• The disk is a flat figure.
• There are two parameters defining the disk (wheel) in the unique way: center of the disk and its radius.
• The area of the disk depends on its radius and can be computed using formula:
$S = \pi R^2$
where:
• S - disk area,
• $\pi$ - constant, that approximates 3.14.
• Circumference of the disk with radius R is:
$L = 2\pi R$
where:
• L - circumference of disk or circle,
• $\pi$ - constant, that approximates 3.14.
• For each disk (wheel) the ratio of its circumference to diameter is constant. This constant is denoted by greek leter π and is approximately 3.14.

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