# Talk:Triangle

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## Semi-protected edit request on 22 February 2016

For the graphic https://en.wikipedia.org/wiki/File:Triangle.TrigArea.svg used under the headings "Computing the area of a triangle" and "Using trigonometry", should it not include the label "c" for side AB? 64.185.148.174 (talk) 04:32, 22 February 2016 (UTC)

The author presumably designed the image for the trigonometry where c is not mentioned, so perhaps deliberately omitted labelling that side. It isn't possible to edit the image from within the article. It was created by editor Limaner who hasn't edited since last April. It would be possible to create a new image if anyone thinks it worthwhile. Dbfirs 08:27, 22 February 2016 (UTC)

## Properties of circles and triangle

I assume all triangles have properties and they should be classified in this article as seven,and circles have the same properties concerning angles without the use of calculator. examples: there are 7 trianlge in which the perimeter are:

${\displaystyle 5+5+1=11}$
${\displaystyle 5+5+2=12}$
${\displaystyle 5+5+3=13}$
${\displaystyle 5+5+4=14}$
${\displaystyle 5+5+5=15}$
${\displaystyle 5+5+6=16}$
${\displaystyle 5+5+7=17}$

${\displaystyle 1-0.98=0.02}$
${\displaystyle 1-0.92=0.8}$
${\displaystyle 1-0.82=0.18}$
${\displaystyle 1-0.68=0.32}$
${\displaystyle 1-0.5=0.50}$
${\displaystyle 1-0.28=0.72}$
${\displaystyle 1-0.02=0.98}$

so 11+12+13+14+15+16+17=98 and 98/7=14

there are 7 circles in which the sum of the angles equals 98

${\displaystyle \arccos 0.98+\arccos 0.1+\arccos 0.1=180}$
${\displaystyle 0.98+0.1+0.1=1.18}$
${\displaystyle \arccos 0.92+\arccos 0.2+\arccos 0.2=180}$
${\displaystyle 0.92+0.2+0.2=1.32}$
${\displaystyle \arccos 0.82+\arccos 0.3+\arccos 0.3=180}$
${\displaystyle 0.82+0.3+0.3=1.42}$
${\displaystyle \arccos 0.68+\arccos 0.4+\arccos 0.4=180}$
${\displaystyle 0.68+0.4+0.4=1.48}$
${\displaystyle \arccos 0.5+\arccos 0.5+\arccos 0.5=180}$
${\displaystyle 0.5+0.5+0.5=1.5}$
${\displaystyle \arccos 0.72+\arccos 0.6+\arccos 0.6=180}$
${\displaystyle 0.28+0.6+0.6=1.48}$
${\displaystyle \arccos 0.02+\arccos 0.7+\arccos 0.7=180}$
${\displaystyle 0.02+0.7^{2}+0.7^{2}=1.42}$

seven

${\displaystyle 1.18+1.32+1.42+1.48+1.5+1.48+1.42=9.8}$
${\displaystyle 2+6+10+14+18+22+26=9.8}$

${\displaystyle 0.68+0.4+0.4=1.48\arccos 0.68+\arccos 0.4+\arccos 0.4=180}$
${\displaystyle 0.68+0.16+0.16=1}$
${\displaystyle 1-0.68=0.32}$
${\displaystyle {\frac {0.32}{2}}=0.16,{\sqrt {0}}.16=0.4}$
${\displaystyle 0.68,0.68+0.16=0.84,0.84+16=1}$
${\displaystyle 0.68\times 100=68,0.84\times 100=84,1\times 100=100}$
${\displaystyle {\frac {68}{4}}=17{\frac {84}{4}}=21{\frac {100}{4}}=25}$
199.7.157.124 (talk) 12:38, 18 July 2016 (UTC)199.7.157.105 (talk) 20:00, 16 July 2016 (UTC)


## Diagram of isosceles right triangle

I have just relabeled this newly added diagram, but I fail to see that it really adds anything to the article. Certainly its location is inappropriate. Any comments or suggestions would be appreciated. --Bill Cherowitzo (talk) 17:13, 6 November 2016 (UTC)