How to find the angle between two points?

I need to draw a line from dot to dot. The length of the line I found out how to now get the angle?
https://jsfiddle.net/slavik_210/bvqLc3wx/13/
July 8th 19 at 12:13
3 answers
July 8th 19 at 12:15
Solution
Strictly speaking, between two points there can be no angle.
Not strictly speaking? - bridget commented on July 8th 19 at 12:18
: not strictly speaking - it's trigonometry 7th grade. Boring. - Lulu_Zulauf71 commented on July 8th 19 at 12:21
https://jsfiddle.net/bvqLc3wx/16/ - Lulu_Zulauf71 commented on July 8th 19 at 12:24
July 8th 19 at 12:17
Solution
tgA = dy/dx
A = arctg(dy/dx)
Thanks for the reply! How do you know dy, dx? - bridget commented on July 8th 19 at 12:20
: dy - difference in Y axis between points. dx = difference in X axis between points - Lulu_Zulauf71 commented on July 8th 19 at 12:23
: I'm confused. How do I know dy and dx? And why do we need to know tgA = dy/dx, if tgA is not used? - Lulu_Zulauf71 commented on July 8th 19 at 12:26
: How to find dx and dy - obviously! For example: dx=x2-x1; dy=y2-y1;
It is unclear quite different - the angle of inclination REGARDING WHAT you need to know? This depends heavily on how it is considered dx and dy :)) - bridget commented on July 8th 19 at 12:29
:
dy = y2 - y1
dx = x1 - x1

https://jsfiddle.net/bvqLc3wx/14/
Stand look - vito.Hoeg commented on July 8th 19 at 12:32
: thanks! In what class are such? - bridget commented on July 8th 19 at 12:35
according to Google, 9+. It's trigonometry.)
festival.1september.ru/articles/639424 - Cristian.Cruickshank commented on July 8th 19 at 12:38
July 8th 19 at 12:19
Google is powerless in the school tasks?
The solution of a right triangle
I'm looking for Yandex. - bridget commented on July 8th 19 at 12:22

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