Talk:Vertex angle

A few days ago, I created the article titled polar sine, that begins thus:

In mathematics, the polar sine of a vertex angle of a polytope is defined as follows. Let v₁, ..., v_n, n ≥ 2, be non-zero vectors from the vertex in the directions of the edges. The polar sine of the vertex angle is

$\operatorname {psin} (v_{1},\dots ,v_{2})={\frac {\operatorname {volume} (v_{1},\dots ,v_{n})}{\|v_{1}\|\cdots \|v_{n}\|}},$

the volume in the numerator being that of the parallelotope whose edges at the vertex in question are the given vectors v₁, ..., v_n.

...with a then-red link to vertex angle. I don't think that topic is addressed in this new article titled vertex angle. Michael Hardy (talk) 18:52, 2 May 2008 (UTC)