Talk:Semiperimeter

Wikilink hover preview

I'm not sure how to edit this, but in the PROPERTIES section, when you hover over the hyperlinked "exicircle" it previews to "incircle". Surely this can be fixed to show the exactly relevant information.

The first sentence is "In any triangle, any vertex and the point where the opposite _excircle_ touches..."

The preview should be this content: "An excircle or escribed circle[2] of the triangle is a circle lying outside the triangle, tangent to one of its sides and tangent to the extensions of the other two. Every triangle has three distinct excircles, each tangent to one of the triangle's sides.[3]"Rmontcal (talk) 10:49, 20 January 2019 (UTC)

Is this an April Fools joke?!

Declaring "half of something" as matter of lexical interest is really a joke. It has to be. I'll add a page 'semilightspeed' and see what happens. 2A02:3100:1155:C400:9D62:89E1:313B:408E (talk) 17:23, 18 February 2024 (UTC)

Next I suppose you'll tell us that we don't need a word for the radius of a circle, because it's just half the diameter? —David Eppstein (talk) 17:42, 18 February 2024 (UTC)

It so happens that in light of other (ultimately somewhat arbitrary) conventions about the choice of basic measurements for lengths and areas of polygons, the half-lengths of sides are more convenient than the lengths per se; this ends up reducing the number of ${\tfrac {1}{2}}$ fractions involved in writing various formulas down, which cuts down on clutter and makes results easier to manipulate and remember. If you want you are of course free to write the ${\tfrac {1}{2}}$ in explicitly and describe everything in terms of the perimeter instead. –jacobolus (t) 21:03, 18 February 2024 (UTC)