OnlineMSchool
Study of mathematics online.
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P. Mathonet
Hello,

I am currently teaching geometry at the University of Liège, Belgium. I found your site when I was looking for a standard notation for the angle of two vectors. Your formula for the angle is correct. However, maybe you should mention that it holds for non-zero vectors and adapt the calculation accordingly. For the vectors (0,0,0) and (1,2,3), it returns the value 0, although the angle is not defined.

Best regards,

P. Mathonet
hfjuuu
3+5+8
James
Sites awesome great help thanks
Shelley
Thank-you. I teach calculus and just found your site. It is super time consuming so that I don't have to manually check 25 different solutions!
jeve
As long as you do the math for the angle between planes, you might as well show the equation for the line, or a point on the line.
Yolanda Vasquez
You have realy help me
Kabutsu
Many thanks for the point to a line distance calculator!
sahar
goog very helpful
Christian Schou
thanks
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