Question

Question #4a948

Answer 1

see below

Explanation:

There is no theorem to prove here because it was generally observed (by some historian) that the circumference of a circle is directly proportional to its diameter, so

`Cpropd`

and the proportionality constant was given a symbol `pi`, hence

`C= pi*d`

`=>pi=C/d`

where, `d` is the diameter of circle.