How to calculation Circumference, Diameter, Area, and also Radius

The circle calculator find the area, radius, diameter and also circumference that a one labeled as a, r, d and c respectively.

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For those having an obstacle using recipe manually to uncover the area, circumference, radius and diameter that a circle, this circle calculator is just for you. The equations will certainly be given listed below so you can see exactly how the calculator obtains the values, however all you need to do is input the basic information. The calculator does the rest.


Finding the Circumference:

The circumference is similar to the perimeter in that it is the complete length needed to attract the circle.

We note the circumference together c.

c = 2πr


c = πd

This depends on whether or not you understand the radius (r) or the diameter (d)

Let’s calculate one manually, for example.

If r = 6 cm, the the circumference is c = 2π(6) = 12π cm, if writing in regards to π. If you choose a numerical value, the prize rounded to the nearest tenth is 37.7 cm.

Suppose friend only know the diameter? If the diameter is 8 cm, climate the one is c = π(8) = 8π or 25.1 cm, rounded to the nearest tenth.

A great thing about the formulas is the you deserve to manipulate it to fix for one unknown if you recognize one of the various other quantities. For example, if we recognize the circumference, but don’t know the radius, you deserve to solve c = 2πr for r and also get \(r = \fracc2\pi\). Similiarly, if you want the diameter from the circumference, just take c =πd and also solve because that d to obtain d = \(\fracc\pi\).


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Finding the Area:

Let a = area of the circle

a = πr²

If you recognize the diameter and also not the radius, just divide the diameter by 2 to obtain the radius and still use the formula above.

Again, the formula can be provided to resolve for the radius, if you know the area. Just divide a by π to obtain r² and also take the square root of the result.

If you great to understand the diameter from the area, monitor the procedure over but dual the result you obtain for r. This is due to the fact that the diameter is double the size of the radius.

Try an instance manually to gain the area.

Suppose r = 5 inches

a = πr²

a = π(25) = 25π

If rounding to the nearest tenth the area is 78.5 square inches.

If you know the diameter, merely divide by 2 to get the radius and also use the same formula as above.

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Of course, you don’t need to go through all the hands-on calculations to use this calculator. Merely input the information you know and also the rest will it is in computed because that you nearly instantly.