A Circle area Pi 3.14159 ø Circle diameter Diameter of Circle. The formula used to calculate circle area is: A x (ø/2) 2. Radius (R) Diameter (D) Circumference (C) Area (A) While a circle, symbolically, represents many different things to many different groups of people including concepts such as eternity, timelessness, and totality, a circle by definition is a simple closed shape. This tool will calculate the area of a circle from the diameter, and will convert different measurement units for diameter and area. If you know the radius of a circle, you can calculate the diameter based on the following formula. Please provide any value below to calculate the remaining values of a circle. If you know the circumference of a circle, you can calculate the diameter based on the following formula:Ĭalculating the Diameter of a Circle Using Radius Next, use this formula to calculate how much fabric you will need. The -2 at each formula indicates that the measurement was reduced by 2 cm (seam allowance). R 4 waist / 2p - 2 for quarter circle skirts.
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