How to know a angle?

Coding Python Support
1

I want to know angle.

How much angle?

And How to made a script?


Here is .blend : http://imall.da.to/tmp/How_to_know_angle.blend

2

isn’t that showing a plane and its normal? It is 90°.

you can use Vector.angle():
http://www.blender.org/documentation/blender_python_api_2_71_release/mathutils.html?highlight=angle#mathutils.Vector.angle