Question

Hey Friends! (Answer anything)​

Answer 1

Answer:

thank u !! (/^▽^)/

Explanation:

In topology, a branch of mathematics, the Klein bottle (/ˈklaɪn/) is an example of a non-orientable surface; it is a two-dimensional manifold against which a system for determining a normal vector cannot be consistently defined. ... The Klein bottle was first described in 1882 by the German mathematician Felix Klein.

Answer 2

Answer:

the time or any part of the time when a radio or television station is on the air.