Angle between two lines

Firstly, do you know how to measure on paper?

Hello,

In the 'Geom' page go to 'Distance' panel. Using the three nodes option select the three nodes of the two line between which you want to measure the angle. This will automatically give you the angle between the two lines.

Please refer below image.

<?xml version="1.0" encoding="UTF-8"?>

Thankyou

Hello,

 

In the 'Geom' page go to 'Distance' panel. Using the three nodes option select the three nodes of the two line between which you want to measure the angle. This will automatically give you the angle between the two lines.

 

Please refer below image.

 

<?xml version="1.0" encoding="UTF-8"?>

 

Thankyou

Could you see the difference the angle forming from '3 nodes' and from '2 arbitrary lines'?

When I say 'angle between 2 lines', I would like to speak about 2  arbitrary lines in space, not your special case where 2 lines forming from 3 nodes.

Two arbitrary lines can mean anything. They can be in different planes or any other special case. In that situation the above solution is not possible. That requires a combination of HM as well as some hand calculations.

The above shown method will only work when the two lines meet at a point.

Please specify in what respect do you want to measure the angle.

Thankyou

Mathematically, just compute dot product of two vectors.