An ideal catenary. Answer me please!

[ValeryOchkov]

 Dear friends!

Tell me honestly:

1) I knew that the chain sags not along a parabola

2) I knew about the physical meaning of the parameter a of a catenary

3) I knew about a catenary number pi?

See please the attach!

I am waiting for your ansvers in this form

1 - yes

2 - no

3 - yes

for example

[Fred_Kohlhepp]

1.   yes

2.   no

3.   no

(2 and 3)  Not until I read your pdf! 😉

[ValeryOchkov]

Thanks, Fred.

An old joke.
Stalin's office.
The phone rings.
The secretary picks up the phone, listens and says to Stalin:
- Comrade Stalin - Churchill is calling you!
Stalin picks up the phone and answers Churchill:
- Yes!
- No!
- No!

- No!

...

- No!

The secretary could not resist and asked:
- Comrade Stalin - what question did you answer Yes!
- Churchill asked - do I hear him well?