Topic: How to calculate nor mathematics? nor (<AOC)

[well20152016]

Prerequisite:
point A ,
point O ,
point B ,
<AOB=90,
<AOC=90,
<COB=90,

Result: nor (<AOC)

[kdub_nz]

I can't understand what you are trying to do ... Do you want to establish some sort of truth table regarding angle equality ??

[Lee Mac]

Use the vector cross product - there are plentiful examples on the forum.

[ssdd]

Code - Auto/Visual Lisp: [Select]

1. (setq nor (v^v (setq x (mapcar '- pt3 pt1)) (mapcar '- pt2 pt1)))
2.   (defun v^v ( u v )
3.     (mapcar '(lambda ( n ) (- (* (nth (car n) u) (nth (cadr n) v)) (* (nth (cadr n) u) (nth (car n) v)))) '((1 2) (2 0) (0 1)))
4.   )

EDIT (John 7 Kaul): Added code tags.

[well20152016]

Thank you for kdub, Lee Mac, ssdd.
But I'm not good at math. Who can help me?

[kdub_nz]

Have a look at something like this.
https://www.mathsisfun.com/algebra/vectors-cross-product.html

I'd like to see a better description of your actual problem.

... this will help others to be of more assistance.