The diameter of a circle is the straight line passing through the center of the circle. Symbols. To find the diagonal of a square, you can use the formula =, where equals one side length of the square. A = Circle area; π = Pi = 3.14159… ø = Circle diameter; Diameter of Circle. The radius is half the diameter, so the radius is 5 feet, or r = 5. It is also called as the longest chord of the circle. This is the radius. Directions: Use the calculator above to calculate your square inches. Find the radius, circumference, and area of a circle if its diameter is equal to 10 feet in length. So, for example, if the square side is equal to 5 in, then the diagonal is 5√2 in ≈ 7.071 in. Enter the area contained within a circle. For an example, we have an area of 303,000 square meters. For any circle, if you divide the circumference by the diameter you get pi, an irregular number usually rounded to 3.14. The diagonal of a square is the line stretching from one corner of the square to the opposite corner. Divide the area (in square units) by Pi (approximately 3.14159). Mils of circular wire or cable can be calculated as: mils = 1000 d (1) where. ø = Circle diameter; A = Circle area; π = Pi = 3.14159… Area of Circle. Diameter of Circle. For quick reference purposes, below is a conversion table that you can use to convert from mm 2 to in 2. You can find the circumference by using the formula. π is, of course, the well-known mathematical constant, about equal to 3.14159. Mils of a 1 inch wire: mils = 1000 (1 in) = 1000 1 square ft. = 144 square inches . So, the circumference is about 31.5 feet around. Sometimes, however, you might be asked to find the length of the diagonal given another value, such as the perimeter or area of the square. To calculate the diagonal of a square, multiply the length of the side by the square root of 2:. The formula used to calculate circle area is: A = π x (ø/ 2) 2. d = diameter of cable or wire (inches) Example - Calculating Mil. To find the SA simply multiply 4 times 3.14159 times the radius square. Conversion Table. Circumference or perimeter of a circle is defined as the distance around it. Type that value into the diagonal of a square calculator to check it yourself! A sphere's surface area can be calculated just by knowing its diameter, or radius (diameter = 2 x radius). d = a√2. Enter the diameter of a … The constant pi, designated by the Greek letter π, is the ratio of the circumference to the diameter of a circle. Area Formulas. A circular mil is the equivalent area of a circle whose diameter is 0.001 (10-3) inch, or approximately 0.7854 millionths of a square inch. This is the diameter of a circle that corresponds to the specified area. Task: Convert 7,500 square millimeters to square inches (show work) Formula: mm 2 ÷ 645.16 = in 2 Calculations: 7,500 mm 2 ÷ 645.16 = 11.62502325 in 2 Result: 7,500 mm 2 is equal to 11.62502325 in 2. To determine the area of a circle from its diameter, divide the diameter by two, square it and multiply by π. The formula used to calculate the circle diameter is: ø = 2 x √(A / π) Symbols. How to find the diagonal of a square - formula. CONVERSIONS & FORMULAS . Example: 303,000/3.14159 = 96447.98; Take the square root of the result (Example: 310.56). The distance from one side of the circle to the other, going through the center of the circle, is the diameter. Flow= 27 cubic ft. l. Square or Rectangle Area l= d. Length x Width 2= ft (square feet) e. Length x width x height = ft. 3 (cubic feet) f. 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