On 25/06/18 18:02, The Natural Philosopher wrote:
On 24/06/18 08:03, Richard wrote:
On 23/06/18 17:01, The Natural Philosopher wrote:

No.
Since no wheel is circular using radious as a concept is plain wrong.
At best you can calcualate a '*radius it would be if it were round*,'
from the actual circumference.

The use of radius is completely right.
The circumference doesn't change. The centre of the instantaneous
circle moves closer to the radius.
The tyre is a three dimensional structure and this debate is being
conducted in a two dimensional manner.


I hope no one ebver emp;loys you in an engineering capacity.

I hope so too, as I am not an engineer.


The use of radius is meaningless. The the tyre is not round.

It doesn't have to be. The radius is the distance between the centre of
the object and a point on the perimeter (circumference). In our case,
the point closest to the centre.
20P and 50P coins have a constant diameter despite not being circular.


Go and get a technical education

I did, but am always learning.