User:Atcovi/Geometry2


 * See also User:Atcovi/Geometry3

Convex, Concave

 * Convex - goes out
 * Concave - goes in

Regular/Irregular
A regular polygon is a polygon that is equiangular (all angles are equal in measure) and equilateral (all sides have the same length) (wikipedia), otherwise it is irregular.

Interior Angles
SUM OF THE INTERIOR ANGLES OF ANY POLYGON: $$(n-2)180$$; "N" being the number of sides. This equation gives the number of triangles. Multiply that by 180 and your answer of the sum of the interior angles has arrived.

Exterior Angles
SUM OF THE EXTERIOR ANGLES IS ALWAYS $$360$$ DEGREES. TO FIND EACH ANGLE, DO $$360/N$$, "N" BEING THE NUMBER OF SIDES.

Procedure

 * 1) Draw an unfinished polygon
 * 2) Find the sum of Ext. Angles:
 * 3) Always $$360$$
 * 4) Find each Ext. Angles:
 * 5) $$360$$/[number of sides]
 * 6) Find each Int. Angle:
 * 7) Interior + Exterior = $$180$$
 * 8) Find the sum of Int. Angles:
 * 9) $$(n-2)180$$