Now double the radius to get the diameter … To find the diagonal of a square, you can use the formula =, where equals one side length of the square. A sphere's surface area can be calculated just by knowing its diameter, or radius (diameter = 2 x radius). ø = Circle diameter; A = Circle area; π = Pi = 3.14159… Area of Circle. Directions: Use the calculator above to calculate your square inches. Diameter of Circle. You can find the circumference by using the formula. Symbols. Enter the diameter of a … To calculate the diagonal of a square, multiply the length of the side by the square root of 2:. The diameter of a circle is the straight line passing through the center of the circle. Formula. π is, of course, the well-known mathematical constant, about equal to 3.14159. For quick reference purposes, below is a conversion table that you can use to convert from mm 2 to in 2. 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. Cubic Area =.785 x Diameter2 or . For any circle, if you divide the circumference by the diameter you get pi, an irregular number usually rounded to 3.14. d = diameter of cable or wire (inches) Example - Calculating Mil. Find the radius, circumference, and area of a circle if its diameter is equal to 10 feet in length. For an example, we have an area of 303,000 square meters. b. To determine the area of a circle from its diameter, divide the diameter by two, square it and multiply by π. d = a√2. a. Circumference or perimeter of a circle is defined as the distance around it. Mils of circular wire or cable can be calculated as: mils = 1000 d (1) where. This is the radius. The constant pi, designated by the Greek letter π, is the ratio of the circumference to the diameter of a circle. It is also called as the longest chord of the circle. Mils of a 1 inch wire: mils = 1000 (1 in) = 1000 If the diameter (d) is equal to 10, you write this value as d = 10. 1 square ft. = 144 square inches . 1. The formula used to calculate circle area is: A = π x (ø/ 2) 2. *Square Inches is also known as (a.k.a) square inch, square in, SqIn, Sq.In., sq.in., in2 & in 2 **This Calculator also calculates square feet, total height in feet, total height in inches, total length in feet and total length in inches. 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. The radius is half the diameter, so the radius is 5 feet, or r = 5. = 9 square ft. c. 1 cubic yd. The formula for calculating the area of … Example: 303,000/3.14159 = 96447.98; Take the square root of the result (Example: 310.56). A = Circle area; π = Pi = 3.14159… ø = Circle diameter; Diameter of Circle. Conversion Table. CONVERSIONS & FORMULAS . This is the diameter of a circle that corresponds to the specified area. How to find the diagonal of a square - formula. So, the circumference is about 31.5 feet around. 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. Enter the area contained within a circle. This tool will calculate the area of a circle from the diameter, and will convert different measurement units for diameter and area. Divide the area (in square units) by Pi (approximately 3.14159). The formula used to calculate the circle diameter is: ø = 2 x √(A / π) Symbols. So, for example, if the square side is equal to 5 in, then the diagonal is 5√2 in ≈ 7.071 in. The distance from one side of the circle to the other, going through the center of the circle, is the diameter. Area Formulas. 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