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# Circle equation how do you measure diameter

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If you know the center, measure the distance between the center and one point on the circumference. Measure with the opening of a compass and report on a ruler, or use a ruler.
Take the measure of the radius and multiply by 2. Any other indirect way of getting the radius does not constitute a measure but a calculation.
The diameter of a circle enters in two formulas.
Length of Circumference: C=Pi*D (D diameter) ====>D=C/Pi
Area of the disk A=Pi *D^2/4 =====>D=SQRT(4*A/Pi), SQRT is the square root operation.

Posted on Jan 01, 2014

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Posted on Jan 02, 2017

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## Related Questions:

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Circumference = Pi (3.14159) times diameter (54") = 169.646
Online circle calculator: http://www.athropolis.ca/popup/c-circ2.htm

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### I know its an old spec, but per ANSI Y14.5M-1982 what is the definition for measuring diameter?

Jean Paul Sartre, the French philosopher, said once (I translate): You can draw a million circles but your will never draw THE CIRCLE. There will always be errors in measurements, That is why engineers who are usually no fools invented the notion of tolerance.
Here is a link to a website that may help you with distinction between the circularity and cylindricity.

GD Cylindricity Definition

Sep 26, 2014 | Computers & Internet

### How do you find the circumfrence of a circle?

If the circle is a drawing, you can measure the diameter and multiply by pi (3.14). The diameter is the widest crossing and goes through the circles center. If the circle is an object, you can wrap tape around it. Mark on the tape where it meets up with the start. Remove the tape, lay it flat and measure it.

May 08, 2014 | Computers & Internet

### 15" circle what is outside measurement

If you would like to know the circumference of a 15" diameter circle this is the formula:
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in our case:
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May 06, 2014 | Cars & Trucks

### How to solve the circumference by using fomulae p=2

The formula is simply this: C = (pi)d. In this equation, "c" represents the circumference of the circle, and "d" represents its diameter. That is to say, you can find the circumference of a circle just by multiplying the diameter by pi, which is an approximation of 3.14.

Jan 30, 2014 | Computers & Internet

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The circumference (C) of a circle and its diameter (D) are related by
C=PI*D (Pi is the famous constant)
D=C/Pi

Jan 08, 2014 | Office Equipment & Supplies

### WHAT ARE ALL OF THE MEASUREMENTS OF A CIRCLE CALLED

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Draw two chords of the circle (any two chords will do, as long as they aren't parallel). Construct perpendicular bisectors of each chord. The center of the circle will be where the two bisectors intersect.

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### The circumference of a circle is 47.1 feet. What is the diameter of the circle?

The circumference of a circle is C=2 * pi * r or C= pi * d.

What do we know? C=47.1 and pi.

What are we trying to calculate? d

Put what we know in the equation and solve for d.

47.1 = pi * d

To isolate d, we have to divide both sides by pi.

47.1
------ = d
pi

I get 14.99' or approximately 15' as the diameter.

Good luck,
Paul

Apr 17, 2013 | Office Equipment & Supplies

### Ts-w3804 cut out diameter

If you purchased new, there should be a template in the box. If not, or you purchased privately, get a tape measure. Measure the inside diameter of the mounting ring (that plastic ring around the outside where you put the screws in). This should give you enough clearance for the basket to fit. An easy way to get a great circle cut. Take your measurement, divide by 2. Take a nail or push pin, tie a piece of string around the pin or nail. Measure the length you can up with by dividing the diameter. Make a mark on the string. Make your measurements on your box where you want you sub to be. Choose the center of where you want the sub and place the push pin / nail there. You can use a pencil to make the diameter by puting a loop in the string where marked the measurement. Then by swingin the string around the center, you create the perfect circle, marking it with your pencil.

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