Math Polygons
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1 Math Polygons
2 Curve & Connected Idea The idea of a curve is something you could draw on paper without lifting your pencil. The idea of connected is that a set can t be split into two disjoint sets.
3 Simple Curve A simple curve is a curve that does not cross itself, with the possible exception of having the same beginning and ending points.
4 Closed Curve A closed curve is a curve that has the same beginning and ending point.
5 Polygon A polygon is a planar figure, that is a simple closed curve consisting entirely of straight segments. Where two segments meet is called a vertex of the polygon. Each segment is called a side of the polygon.
6 Convex and Concave Polygons A convex polygon is one in which every point in the interior of the polygon can be joined by a line segment that stays entirely inside the polygon. A concave polygon would be one in which there exist at least two points, such that when joined by a line segment, the segment passes outside of the polygon.
7 Polygonal Region A polygon divides the plane its in, into three regions, the interior, exterior, and the curve itself. The interior and the curve itself comprise the polygonal region we are concerned with.
8 Types of Polygons Polygons are classified, primarily, according to the number of sides that they have. This is summarized in the following table.
9 Types of Polygons (cont) Polygon Triangle Quadrilateral Pentagon Hexagon Heptagon Octagon Nonagon Decagon n-gon Number of Sides (or vertices) n
10 Parts of a Polygon Side Vertex Interior angle Exterior angle diagonal
11 Interior Angle An interior angle of a polygon is created by three consecutive vertices.
12 Exterior Angle An exterior angle of a polygon is created by extending a side out from the polygon and reading the angle between the contiguous side.
13 Diagonal A diagonal of a polygon is a segment connecting any two non-consecutive vertices.
14 exterior Ex A interior B E interior angle C A F exterior angle B vertex D side E C G diagonal D exterior angle
15 Congruency Idea Two segments are congruent if the tracing of one can be fitted exactly onto the other. Two angles are congruent if their measures are the same. Two polygons are congruent if all their parts are congruent. Notation:
16 Ex. B A C E F G H I D EFG HIJ AB CD J
17 Regular Polygon A polygon is called regular if all its angles and sides are congruent.
18 Ex
19 Further Classification of Polygons Triangles Quadrilaterals
20 Triangles Right triangle Acute triangle Obtuse triangle Scalene triangle Isosceles triangle Equilateral triangle
21 Right Triangle A right triangle contains exactly one right angle.
22 Acute & Obtuse Triangle An acute triangle contains all acute angles while an obtuse triangle contains exactly one obtuse angle.
23 Scalene Triangle A scalene triangle has three non-congruent sides. (ie all the sides are of different length.)
24 Isosceles Triangle An isosceles triangle has at least two congruent sides.
25 Equilateral Triangle An equilateral triangle is a triangle with all sides congruent.
26 Quadrilaterals Trapezoid Kite Isosceles trapezoid Parallelogram Rectangle Rhombus Square
27 Trapezoid A trapezoid is a quadrilateral with at least one pair of parallel sides.
28 Isosceles Trapezoid An isosceles trapezoid is a trapezoid with the non-parallel sides being congruent
29 Kite A quadrilateral with two non-overlapping pairs of congruent adjacent sides. NON-VERTEX ANGLES VERTEX ANGLES
30 Parallelogram A parallelogram is a quadrilateral with opposite sides parallel.
31 Rectangle A rectangle is a parallelogram with a right angle.
32 Rhombus A rhombus is a quadrilateral with four congruent sides.
33 Square A square is a rhombus with a right angle.
34 Quadrilateral Hierarchy By looking at the definitions, we see that some of the quadrilateral definitions fulfill one or more of the other definitions automatically. For example, the definition of a square also satisfies the definition of a rhombus. This allows us to set up a hierarchy among the quadrilaterals which will be very useful when discussing their various properties.
35 Quadrilateral Kite Trapezoid Parallelogram Quadrilateral Hierarchy Isosceles Trapezoid Rhombus Rectangle Square
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