Wikipedia:Reference desk/Archives/Mathematics/2008 June 22
| Mathematics desk | ||
|---|---|---|
| < June 21 | << May | June | Jul >> | June 23 > |
| Welcome to the Wikipedia Mathematics Reference Desk Archives |
|---|
| The page you are currently viewing is an archive page. While you can leave answers for any questions shown below, please ask new questions on one of the current reference desk pages. |
June 22
editBrahmagupta's formula
editBrahmagupta#Geometry has a "Reference diagram" marked ABCDpqrs and text using abcd and s. I think abcd are really pqrs and the text s is something else. Could someone please explain what the text all means - I find it unclear - and better yet edit the article or diagram to make them match. -- SGBailey (talk) 09:37, 22 June 2008 (UTC)
- S is half the sum of the sides and I think the picture should be replaced with one that shows the lengths of the sides as a, b, c and d. So, in the text, the lowercase variables are the lengths of the four sides which are shown as p, q, r and s in the picture. Zain Ebrahim (talk) 09:43, 22 June 2008 (UTC)
- It's easier to edit the text, so I've done that. —Ilmari Karonen (talk) 11:25, 22 June 2008 (UTC)
Carrying on down to the next figure we have "root(ac+bd)" without abcd being defined. I think these are some of pqrs in the diagram above, but which is which. Should this be changed to "root((AB)(CD)+(BC)(AD))"? -- SGBailey (talk) 13:48, 22 June 2008 (UTC)