Talk:Spherical trigonometry

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Contents 1 Radians or degrees 2 Explicit Radius? 3 Valid theorems 4 Neper's circle 5 Minor vandalism 6 Some Work Needed

[edit] Radians or degrees

this artical seems over complicated by use of both degrees and radians. I propose to a change to make it entirely radians.
so for example
"E=A+B+C-π radians" —Preceding unsigned comment added by 138.251.30.10 (talk) 15:52, 3 October 2007 (UTC)

[edit] Explicit Radius?

It seems necessary to say something about the radius in the sin law? —Preceding unsigned comment added by 71.230.115.205 (talk) 20:07, 7 May 2009 (UTC)

[edit] Valid theorems

Please try to answer whether these questions are known:

1. Is SSS a valid congruence theorem for spherical triangles??
2. Is SAS a valid congruence theorem for spherical triangles??
3. Is ASA a valid congruence theorem for spherical triangles??
4. Is AAS a valid congruence theorem for spherical triangles??

66.245.7.28 18:33, 6 Nov 2004 (UTC)

[edit] Neper's circle

I corrected the image for Neper's circle

Eroica 08:30, 1 November 2005 (UTC)

I corrected the image a bit more. The original figure was mismatched with the description of the equations given in the text. The figure, as it was previously drawn was similar to the one on the referred page: http://www.rwgrayprojects.com/rbfnotes/trig/strig/strig.html. The equations as stated in the wiki article are the co-equations of this page. So either the equations need to be corrected, or the picture needed to have the complementary angles drawn. I chose to fix the picture.

Arif Zaman 16:29, 19 December 2005 (UTC)

the image labeled "Spherical Triangle" is actually of a "right spherical triangle", as indicated by its German title: rechtkugel dreieck, literally "right-angle three-corner". --Don 23:56, 13 August 2007 (UTC)

Since the image is a projection into R^2 and none of the angles are labelled with an "L" type symbol indicating an angle of pi/2, i think that the figure can be used as a general spherical triangle on S^2 without much problem... Boud (talk) 16:57, 4 March 2008 (UTC)

[edit] Minor vandalism

No idea why someone would want to remove large sections of this page as has been done recently. The last edit (which i reverted) was from someone at an IP in Kowloon, P.R.China. Maybe just experimenting to see if wikipedia is available. Or a Chinese censor trying to be disruptive? Who knows, this is just speculation... Let's just revert to the full version. Boud (talk) 16:57, 4 March 2008 (UTC)

[edit] Some Work Needed

This entry needs some work before it is explanatory. It uses a lot of terms without defining them. For example, the formula sin A/sin a etc is stated without explaining what a, A, b, B etc refer to. The diagram is pretty but the letters in it do not correspond to those used in the entry. —Preceding unsigned comment added by Gnomon (talk • contribs) 23:06, 21 November 2008 (UTC)