# Finding the biggest angle between lines

Michael shared this question 3 years ago

Hello, I'm trying to use the angle tool (or the command) to calculate the angle between two lines that intersect each other, however it always seems to choose the smaller one, which is what we want in most cases, but right now I need the biggest one, which is the smaller's supplementary. I can always put three points and force the angle I want using them, but is there an elegant way to do it using the angle tool or perhaps another command? maybe a command that gets me the supplementary angle? I couldn't find anything like that, so please help me out, thanks in advance!

1

You can set the option for an angle to be 0-360. Also maybe check out the atan2(y,x) command

2

One possibility (with draw the angle in the graphic)

2

sorry above version 01 is wrong.

use this version 02 (include check direction angle:= smaller of {ABC or CBA)}

Note: if you need only the value, then exists more easy solutions.

2

Another, simpler solution.

4

Answering questions without feedback from the questioner is not something I really like.

Quote: "thanks in advance!" is pure laziness and neither a thanks nor a feddback.

2

Don't worry rami... it happens a lot!

But you can be sure that your contributions are very appreciated by everyone, and a continuous source of inspiration for all (and especially for me!) :)

I'm telling you thank you for this :)

Take care

1

Thanks rami for exellent files.

1

Sorry about that, I've been very busy with school. Your files made things very clear and easy for me as a GeoGebra newbie, thanks a lot for helping me and anyone else who might have this question in the future.

1

@Michael

The fact that my reprimand has just hit you, is pure coincidence.I wanted to criticize this habit generally, which is spreading more and more.

Feedback is not so much a matter of thanks as of finding out whether the answer was exactly what the questioner wanted. Only in this way can I learn by myself.

In this sense: thank you very much for the feedback.

1

dear rami;

you are one of best educator for geogebra and mathemathics.

best wishes for you