I. Definition and Identification
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1 Notes: Polygons
2 I. Definition and Identification A polygon is defined as a closed plane figure formed by three or more line segments that intersect only at their endpoints.
3 A triangle is defined as a three-sided polygon, and a quadrilateral is a four-sided polygon.
4 You can name a polygon by the number of its sides. The table shows the names of some common polygons. You must memorize these (you will have a quiz over this on Friday).
5 Ex 1a: Tell whether the figure is a polygon. If it is a polygon, name it by the number of sides. polygon, hexagon
6 Ex 1b: Tell whether the figure is a polygon. If it is a polygon, name it by the number of sides. polygon, heptagon
7 Ex 1c: Tell whether the figure is a polygon. If it is a polygon, name it by the number of sides. not a polygon- curved side
8 Ex 1d: Tell whether each figure is a polygon. If it is a polygon, name it by the number of its sides. not a polygon
9 Ex 1e: Tell whether the figure is a polygon. If it is a polygon, name it by the number of its sides. polygon, nonagon
10 Ex 1f: Tell whether the figure is a polygon. If it is a polygon, name it by the number of its sides. not a polygon
11 II. Sides, Diagonals and Vertices Each segment that forms a polygon is a side of the polygon. The common endpoint of two sides is a vertex of the polygon. A segment that connects any two nonconsecutive vertices is a diagonal.
12 Two lines or two angles are congruent if they have the same measure. The symbol for congruent is. All the sides are congruent in an equilateral polygon. All the angles are congruent in an equiangular polygon. A regular polygon is one that is both equilateral and equiangular. If a polygon is not regular, it is called irregular.
13 A polygon is concave if any part of a diagonal contains points in the exterior (ouside) of the polygon. If no diagonal contains points in the exterior, then the polygon is convex. A regular polygon is always convex.
14 Example 2A: Classifying Polygons Tell whether the polygon is regular or irregular. Tell whether it is concave or convex. The dashes on all four sides are the same. This tells us that all four sides are congruent. The symbols in the vertices tells us that there are two pairs of congruent sides, but not all four sides are congruent with each other. This polygon is irregular. There are no diagonals that have points in the exterior of the figure. Therefore the polygon is convex.
15 Example 2B: Classifying Polygons Tell whether the polygon is regular or irregular. Tell whether it is concave or convex. irregular, concave
16 Example 2C: Classifying Polygons Tell whether the polygon is regular or irregular. Tell whether it is concave or convex. regular, convex
17 Check It Out! Example 2a Tell whether the polygon is regular or irregular. Tell whether it is concave or convex. regular, convex
18 Check It Out! Example 2b Tell whether the polygon is regular or irregular. Tell whether it is concave or convex. irregular, concave
19 III. Special Quadrilaterals Some quadrilaterals have special characteristics, and are therefore give special names. A quadrilateral with two pairs of parallel sides is a parallelogram. To write the name of a parallelogram, you use the symbol. The symbol for parallel is two vertical lines ll.
20 A rectangle is a quadrilateral with four right angles.
21 A rhombus is a quadrilateral with four congruent sides.
22 A square is a quadrilateral with four right angles and four congruent sides. A square is a parallelogram, a rectangle, and a rhombus.
23 A trapezoid is a quadrilateral with exactly one pair of parallel sides. Each of the parallel sides is called a base. The nonparallel sides are called legs. Base angles of a trapezoid are two consecutive angles whose common side is a base. If the legs of a trapezoid are congruent, the trapezoid is an isosceles trapezoid.
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