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Circle/Sector Calculator

circle approximations

Area:
circumference:
diameter:

Enter any one known value

area:
c:
d:
r:

Only Two Values Required

Circle Tutorial

Circle formulas are shown below:

\text{circumference}=\text{diameter}\cdot \pi

The circumfrence of a circle is the perimiter of the circle or the distance around the circle. The diameter of a circle is the distance from opposite points on the circle and also the height of a circle. The radius of a circle is the distance from the center of a circle to any point on a circle and is half the length of the diameter. The area of a circle is the total amount surface of a circle. Finding values in a circle is very simple because only one value in a circle is needed to find all other values. If given the radius then the diameter is already two times that value and if given the diameter, the radius is half of that value. If told to find all values of a cricle given a radius of length 7, you can use the calculation process shown below:

Finding the diameter

\text{diameter}=(7)\cdot \text{2}

\text{diameter}=14

Finding the circumference

\text{circumference}=\text{diameter}\cdot \pi

\text{circumference}=(14)\cdot \pi

\text{circumference}=14\pi

Finding the area