– π (pi) is a mathematical constant, approximately equal to 3.14159 If we know the circumference of a circle, we can easily find out its radius by rearranging this formula and solving for ‘r’: r = C / ...

The circumference of a circle is the distance around the shape. The ability to round a number to a number of decimal places or to a number of significant figures means that answers can be written to ...

In everyday life, we often come across circular objects, from wheels to plates and bracelets. You might find it useful to know just how big these circular objects are. Understanding how to calculate ...

Pi represents the ratio of the circumference of a circle to its diameter. When you purchase through links on our site, we may earn an affiliate commission. Here’s how it works. Pi is a number that ...

The radius of a circle or a sphere is the distance between the center and the edge. The radius can be used to calculate a circle's diameter, area and circumference. Likewise, a sphere's volume is ...

Randomly toss some toothpicks, with pi as your reward. Asked to get an estimate for the famed mathematical constant pi (π), you might do what the ancient Greeks did: Divide the circumference of a ...