From a multiple regression analysis of the data, Dr. Soloway devised a formula to predict flap size: for a corneal diameter less than 11.2 mm, divide the keratometry reading by 4.7; between 11.2 ...

It is another name for the perimeter of a circle. The circumference of a circle is calculated using the formula: circumference = π × diameter ...

The formula for the area of the circle is 𝑨 = π𝒓². To work out the area of a circle: Find the value of the radius. If the diameter is given, this must be halved.

A crop circle thought to be inspired by a formula acclaimed as the most beautiful in all mathematics has appeared on a hillside in Wiltshire. By Matthew Moore and Matthewmoore 24 May 2010 • 5:30pm ...