Enter the diameter of a circle. Given any one variable A, C, r or d of a circle you can calculate the other three unknowns. This calculator converts the area of a circle into a square with four even length sides and four right angles. Also, explore the surface area or volume calculators, as well as hundreds of other math, finance, fitness, and health calculators. The formula used to calculate circle area is: A = π x (ø/ 2) 2. A = Circle area; π = Pi = 3.14159… ø = Circle diameter; Diameter of Circle. 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. To calculate the area of polygons inscribed in a circle. Then, we want to calculate the area of a part of a circle, expressed by the central angle. Remember this tool should be used only to calculate area, perimeter or volume of a figure. About Square Calculator tool. 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 Use this circle calculator to find the area, circumference, radius or diameter of a circle. This free volume calculator can compute the volumes of common shapes, including that of a sphere, cone, cube, cylinder, capsule, cap, conical frustum, ellipsoid, and square pyramid. In the result you will get all unknown variables presented. The radius of a circumcircle of a square is equal to the radius of a square. 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. The circle calculator finds the area, radius, diameter and circumference of a circle labeled as a, r, d and c respectively. Solution: In this exercise we have the opposite situation. The area of some circle is known and equals 15.7 m².What we need to calculate is the radius and diameter. The results we provide … You can use numerous different inputs and choose to submit the radius, the diameter or the circumference of the circle. Comment/Request An accuracy option that is < (less than) 6 digits in decimal form. Use this calculation to calculate the area of a circle. Units: Note that units of length are shown for … Circle Formula's Radius R = D ÷ 2 where R = radius, D = diameter Area; A = π * D² ÷ 4 √ = square root Calculator Use. 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. 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. To run the calculator, hit the 'Calculate Circle Dimensions' button when you have entered the known diameter. Symbols. 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. 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. 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