find angle between lines

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OriAlpha
OriAlpha 2018-12-25
编辑： madhan ravi 2018-12-25
hello
i need to find the angles between lines
how can i do in code
  1 个评论
John D'Errico
John D'Errico 2018-12-25
编辑：John D'Errico 2018-12-25
As a hint:
http://mathworld.wolfram.com/LawofCosines.html
That will suffice. Why not try it?
Or, you could find the inclination of each line, best done using atan2. Then subtract. That too will work, as long as you are careful.
https://www.mathstopia.net/coordinate-geometry/angle-two-lines

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madhan ravi
madhan ravi 2018-12-25
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OriAlpha
OriAlpha 2018-12-25
dont get me wrong can u formulate for 3 points
madhan ravi
madhan ravi 2018-12-25
编辑：madhan ravi 2018-12-25
x = [800 905]; % common point
y = [250 330];
a = [800 905]; % common point
b = [825 333];
angle_between = (atan((y(2)-y(1))/(x(2)-x(1)))...
- atan((b(2)-b(1))/(a(2)-a(1)))) * 180/pi % in degrees

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