The wheel diameter is measured from lip to lip of a tyre, and coincides with the wheel rim size. The wheel radius is half the wheel diameter, the distance from the centre of the wheel, the axle, to ...

I’m a journalism student in college, and math is one of the requirements for not only graduation, but also to help me transfer to a four-year school. There are going to be some situations coming my ...

The perimeter of a circle is called the circumference. The shortest distance from the centre to the circumference is called the radius. The line across the centre of a circle is the diameter, this is ...

Most wire or string is made with a circular cross section of some particular radius and diameter. The area of that cross section is the well known A = pi*R² which is colloquially pronounced as “pie ...