MATH1180 Lecture Notes - Lecture 6: Nonagon, Parallelogram, Decagon
10 Oct 2016
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A plane figure is closed if we can draw it without lifting the pencil and if the starting and ending points are the same. A plane figure is simple if we can draw it without lifting the pencil and in drawing it we never pass through the same point twice, with the possible exception of the starting and ending points. Polygon: a simple, closed, plane figure, consisting only of line segments, called edges, such that no two consecutive edges lie on the same plane. Regular polygon: all of its sides are the same length and all of its edges have the same measure. Trapezoid: at least one pair of parallel sides. Square: all sides are equal and four right angles. Angle sum of a polygon: the sum of the measures of the interior angles of a convex polygon having n sides is (n-2)180.
