In geometry, the area enclosed by a circle of radius r is π r .

The number π has application in calculating statistical distributions like the normal distribution (gaussian distribution), which are used throughout the sciences.If you'd like to cite this online calculator resource and information as provided on the page, you can use the following citation: Our online calculators, converters, randomizers, and content are provided "as is", free of charge, and without any warranty or guarantee. Area of Circle … Here the Greek letter π represents a constant, approximately equal to 3.14159, which is equal to the ratio of the circumference of any circle to its diameter. The area of a circle is the number of square units inside that circle. Use Enter the radius, diameter, circumference or area of a Circle to find the other three. Circles are used when planning athletic tracks, recreational areas, buildings, and roundabouts, so knowing their area is important in construction, landscaping, etc. The calculations are done "live": How to Calculate the Area. Use this calculator to easily calculate the area of a circle, given its radius in any metric: mm, cm, meters, km, inches, feet, yards, miles, etc.π is, of course, the famous mathematical constant, equal to about 3.14159, which was originally defined as the ratio of a circle's circumference to its diameter. For example, if the radius is 5 inches, then using the first area formula calculate π x 5Task 2: Find the area of a circle given its diameter is 12 cm. Circle-like parts, e.g. Click once in an ANSWER BOX and type in your answer; then click ENTER.
By using this site you agree to the use of cookies for analytics, personalized content and ads. What is the area of the circle?Summary: Given the radius or diameter of a circle, we can find its area. Each tool is carefully developed and rigorously tested, and our content is well-sourced, but despite our best effort it is possible they contain errors. Here PI value is fixed which is 22/7 or 3.1415926535, but for this problem, we are using a PI value up to 5 decimal digits, If you want to know more about PI click here. The formula above is the one used in our area of a circle calculator.Calculation is easy once you have measured the circle's radius or diameter, or if you know it from plans and schematics: just plug the numbers into the formulas above use our area of a circle calculator above. The invention of the wheel was one of the transforming events in early human history, as it dramatically reduced the energy expended in moving stuff around and made travelling easier. If each square in the circle to the left has an area of 1 cm 2, you could count the total number of squares to get the area of this circle. Apply the second equation to get π x (12 / 2)Circle geometry has a wide array of practical uses. You can find the PI value up to 1,00,000 Decimal Digits. We are not to be held responsible for any resulting damages from proper or improper use of the service.

cylinders, tubes, gears, and others are used by engineers in clocks, bikes, cars, trains, ships, planes, and even rockets. The formulas for the diameter and area of a circle are listed below:Directions: Read each question below. The famous Ferris-wheel attraction is a circle, as are the wheels on your car or bike. Area of a circle formula.
To start over, click CLEAR. Area of a Circle = πr2 or PI * Radius * Radius. If you are measuring it by hand, remember that the diameter is the largest measurement you can get from a circle.Task 1: Given the radius of a cricle, find its area. Example 1: The radius of a circle is 3 inches. We can also find the radius (and diameter) of a circle given its area. The Formula for Area of Circle. The formula for the area of a circle is π x radius 2, but the diameter of the circle is d = 2 x r 2, so another way to write it is π x (diameter / 2) 2.Visual on the figure below: π is, of course, the famous mathematical constant, equal to about 3.14159, which was originally defined as the ratio of a circle's circumference to its diameter. Area of a Circle Calculator. The area of a circle is:

After you click ENTER, a message will appear in the RESULTS BOX to indicate whether your answer is correct or incorrect.


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