Comment/Request Very helpful website - thank you very much! Area of a Circle Calculator. Calculations at a round corner, or rather in a quarter circle, the most simple form of a round corner. The area of a circle is: π times the Radius squared: A = π r 2. or, when you know the Diameter: A = (π /4) × D 2. or, when you know the Circumference: A = C 2 / 4 π. However, it is mainly designed to support the computation of sphere radius.Try this calculator now by entering one of the chosen parameters into the appropriate field or read on and learn how to find the radius of a sphere. For example, if the diameter is 8 cm 8\text{cm} 8 cm, the radius will be 4 cm 4\text{cm} 4 cm. The used formula for calculations are indicated below the form. The formula below describes the surface area of a ball with a given radius r: A = 4πr 2. The area of a circle is A = pi multiplied with r² and the circumference is U = 2 multiplied with pi multiplied with r, in which pi is the circle constant (approximately 3,14). You can also see at the bottom of the calculator, the step-by-step solution. C# Program to Calculate Area of Circle. This geometry calculator will take one known circle measurement (area, circumference, diameter, or radius) and calculate the other three. This means you can use this tool to do other calculations such as diameter to circumference, radius to area, radius to cicumference, area to radius, area to circumference etc. The radius of a circle when the area is given is the distance from the center outwards provided the value of the area is given is calculated using Radius=sqrt(Area of Circle/pi).To calculate Radius of a circle when area is given, you need Area of Circle (A).With our tool, you need to enter the respective value for Area of Circle and hit the calculate button. Our calculator … The height of the arc on my project was 1″. Clear All Clear Last Point Share Area. Everyone who receives the link will be able to view this calculation, Copyright © PlanetCalc Version: An online circumference calculator that allows you to find circumference, radius, diameter, area, sphere surface area, and sphere volume of a circle. The radius can be expressed as either degrees or radians, with our area of a sector calculator accepting only degrees for now (let us know if it would help you if it supported radians as well). This can be done by re-arranging the formula. The radius is the distance between the centre and any point on the outer edge of a circle. Example: 303,000/3.14159 = 96447.98; Take the square root of the result (Example: 310.56). Click save settings to reload page with unique web page address for bookmarking and sharing the current tool settings, or click flip tool to reverse the tool function with current settings, Switch tool with the current settings for radius, and calculate circle circumference, circle diameter, sphere volume or sphere surface area instead. As an example, the surface area of a ball with a radius of 10 cm can be found below: A = 4πr 2; A = 4π * 10 2 = 1256.64 cm 2 This circumference of a circle calculator is 100% free and provides you with the precise measurements. You will find these 2 graphics helpful when using this calculator, working with central angles, calculating arc lengths, etc. Finally, you can find the diameter - it is simply double the radius: D = 2 * R = 2 * 14 = 28 cm. The easiest way to find the radius is by dividing the diameter in half. Radius Calculator. For arched door entries and other arched openings, we will need two measurements; WIDTH and RISE. The formula for finding the area of a circle is pi*r*r where r is the radius. The formula used to calculate circle radius is: r = ø / 2. Circle Calculator. The first step is to ensure that the area you are looking to calculate is in fact a semi circle. For example, if 10,582 is square kilometers, then the answer is 58,038 kilometers. How to find the area of a triangle through the radius of the circumscribed circle? Example of how to calculate the surface area of a ball shape. and π is a constant estimated to be 3.142. In this C program, we allow the user to enter the radius, and We defined pi as a global variable and assigned value as 3.14. This online calculator calculates a radius of a circle from the given area of a circle. A triangle is circumscribed in a circle if all three vertices of the triangle are tangent to the circle. This is the intersecting set of a square with edge length a and a circle with radius a, where one corner of the square is at the center of the circle. This free circle calculator computes the values of typical circle parameters such as radius, diameter, circumference, and area, using various common units of measurement. Learn how PLANETCALC and our partners collect and use data. Diameter - radius - circumference - area Calculator. Calculate area, circumference and radius of a circle. You can also use it to find the area of a circle: A = π * R² = π * 14² = 615.752 cm². The value of the radius is half of the sphere diameter. The calculations are done "live": How to Calculate the Area. We'll give you a tour of the most essential pieces of information regarding the area of a circle, its diameter, and its radius. The used formula for calculations are indicated below the form. To use this online calculator for Perimeter of a quarter circle when radius is given, enter Radius (r) and hit the calculate button. Instead try one of the other circle dimension calculators: Circle Radius Calculator; Circle Diameter Calculator An online circumference calculator that allows you to find circumference, radius, diameter, area, sphere surface area, and sphere volume of a circle. Explore many other math calculators like the area and surface area calculators, as well as hundreds of other calculators related to finance, health, fitness, and more. How to calculate the area of a semi circle. Use the this circle area calculator below to find the area of a circle given its radius, or other parameters. C Program to Calculate Area Of a Circle using Radius. By using this website, you agree to our Cookie Policy. How to calculate the area of a semi circle? Includes all equations (formula) As you know, the area of a circle is calculated by the following formula: Accordingly, the formula for finding the radius from the area is: The calculator below uses this formula to calculate the radius. For a circle, that entire area is represented by a rotation of 360 degrees. Enter the radius, diameter, circumference or area of a Circle to find the other three. Plus, unlike other online circle calculators, this calculator will show its work and give a detailed, step-by-step explanation of the formulas and sequence used to arrive at each result. Choose: square mils, square inches, square feet, square yards, square miles, acres, hectares, square millimeters, square centimeters, square meters, and square kilometers. Our calculator can also convert the result to different units. Diameter - radius - circumference - area Calculator. Search. If using this calculator to compute the surface area of a hollow sphere, subtract the surface area of the base. You can enter the radius and then compute diameter and circumference in mils, inches, feet, yards, miles, millimeters, centimeters, meters and kilometers.. 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