Differences

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--- urp:geometry [2021-10-13]
nerf_herder
+++ urp:geometry [2021-11-17] (current)
nerf_herder
@@ Line 2: / Line 2: @@
   * [[Angles|Angles and Vectors]]
-  * [[Polygons]]
   * [[Triangles]]
   * [[Circles|Circles, Chords, etc]]
-  * [[Graphing|Graphing curves, circles, etc.]]
+  * [[Polygons]]
+=== misc ===
+Truth tables:
+first columns : True/False values of the variables, such as p, q, or p' or ~p for inverse values. Next columns are logic combinations of the variables
-====Polygons====
+| p | q | p ⋂ q | p ⋃ q| p => q |
+| T | T | T | T | T |
+| T | F | F | T | F |
+| F | T | F | T | T |
+| F | F | F | F | T |
-The __sum of angles in a polygon__ = 180 (n - 2), where n = number of sides. This can also be written as: 180 + 180 (n-3). (Basically you add in another triangle when adding a side to polygon)
+p => q means condition p implies condition q. If p is true, then an implication can be drawn or not, depending on q. If p is false, then an implication cannot be ruled out, regardless of q, so it is left as true.
 === See Also ===
-  * https://www2.clarku.edu/faculty/djoyce/trig/identities.html
   * 11 pages of definitions, postulates and theorems: http://www.ouchihs.org/ourpages/auto/2013/7/26/52822673/Geo-PostulatesTheorems-List.pdf
 Back to [[math]] page.

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