Suppose I have a point $(a,b,c)$. What is the distance from this point to the $x$-axis?
I had supposed that it would be simply $\sqrt{b^2+c^2}$ but this does not seem to be the case.
Suppose I have a point $(a,b,c)$. What is the distance from this point to the $x$-axis?
I had supposed that it would be simply $\sqrt{b^2+c^2}$ but this does not seem to be the case.
In fact is $\sqrt{b^2+c^2}$. You can see this if you think about the point $(a,b,c)$ in the plane $(a,0,0)$.