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Use this circle calculator to find the area, circumference, radius or diameter of a circle. The radius of a circumcircle of a square is equal to the radius of a square. For angles of 2π (full circle), the area is equal to πr²: 2π → πr²; So, what's the area for the sector of a circle: α → Sector Area; From the proportion we can easily find the final sector area formula: Sector Area = α * πr² / 2π = α * r² / 2 The circle calculator finds the area, radius, diameter and circumference of a circle labeled as a, r, d and c respectively. About Square Calculator tool. Circumscribed circle of a square is made through the four vertices of a square. The area of some circle is known and equals 15.7 m².What we need to calculate is the radius and diameter. Symbols. Solution: In this exercise we have the opposite situation. With this semicircle area calculator, you can quickly find the area of half of a circle.What is more, the tool also doubles as a semicircle perimeter calculator, so inputting radius or diameter will help you find the basic features of the shape in the blink of an eye.In the article below, we provide the semicircle definition and explain how to find the perimeter and area of a semicircle. Circle Formula's Radius R = D ÷ 2 where R = radius, D = diameter Area; A = π * D² ÷ 4 Comment/Request An accuracy option that is < (less than) 6 digits in decimal form. Also, explore the surface area or volume calculators, as well as hundreds of other math, finance, fitness, and health calculators. Exercise 2: The area of a circle is 35 m² (square meters). 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. Use this calculation to calculate the area of a circle. Then, we want to calculate the area of a part of a circle, expressed by the central angle. This calculator converts the area of a circle into a square with four even length sides and four right angles. This free area calculator determines the area of a number of common shapes using both metric units and US customary units of length, including rectangle, triangle, trapezoid, circle, sector, ellipse, and parallelogram. For those having difficulty using formulas manually to find the area, circumference, radius and diameter of a circle, this circle calculator is just for you. To run the calculator, hit the 'Calculate Circle Dimensions' button when you have entered the known diameter. The formula used to calculate circle area is: A = π x (ø/ 2) 2. You can use numerous different inputs and choose to submit the radius, the diameter or the circumference of the circle. √ = square root Calculator Use. 2017/04/20 20:12 Male/60 years old level or over/A retired people/Useful/ Purpose of use Formula used to calculate the area of circumscribed square is: 2 * r 2 where, r is the radius of the circle in which a square is circumscribed by circle. Units: Note that units of length are shown for … Remember this tool should be used only to calculate area, perimeter or volume of a figure. Compute the area using these units: square mils, square inches, square feet, square yards, square miles, acres, hectares, square millimeters, square centimeters, square meters, and square kilometers. In the result you will get all unknown variables presented. Enter the diameter of a circle. A = Circle area; π = Pi = 3.14159… ø = Circle diameter; Diameter of Circle. Given any one variable A, C, r or d of a circle you can calculate the other three unknowns. 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