EXAMPLE 1 Identify polygons

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EXAMPLE 1 Identify polygons Tell whether the figure is a polygon and whether it is convex or concave. a. b. c. d. SOLUTION Some segments intersect more than two segments, so it is not a polygon. a. b. The figure is a convex polygon. Part of the figure is not a segment, so it is not a polygon. c. d. The figure is a concave polygon.

EXAMPLE 2 Classify polygons Classify the polygon by the number of sides. Tell whether the polygon is equilateral, equiangular, or regular. Explain your reasoning. a. b. SOLUTION The polygon has 6 sides. It is equilateral and equiangular, so it is a regular hexagon. a. The polygon has 4 sides, so it is a quadrilateral. It is not equilateral or equiangular, so it is not regular. b.

EXAMPLE 2 Classify polygons Classify the polygon by the number of sides. Tell whether the polygon is equilateral, equiangular, or regular. Explain your reasoning. c. SOLUTION c. The polygon has 12 sides, so it is a dodecagon. The sides are congruent, so it is equilateral. The polygon is not convex, so it is not regular.

GUIDED PRACTICE for Examples 1 and 2 Sketch an example of a convex heptagon and an example of a concave heptagon. 1. ANSWER

GUIDED PRACTICE for Examples 1 and 2 Classify the polygon shown at the right by the number of sides. Explain how you know that the sides of the polygon are congruent and that the angles of the polygon are congruent. 2. Quadrilateral. They all have the same length; they are all right angles. ANSWER

EXAMPLE 3 Find side lengths A table is shaped like a regular hexagon.The expressions shown represent side lengths of the hexagonal table. Find the length of a side. ALGEBRA SOLUTION First, write and solve an equation to find the value of x. Use the fact that the sides of a regular hexagon are congruent. 3x + 6 4x – 2 = Write equation. 6 = x – 2 Subtract 3x from each side. 8 = x Add 2 to each side.

EXAMPLE 3 Find side lengths Then find a side length. Evaluate one of the expressions when x = 8. 30 3(8) + 6 = 3x + 6 The length of a side of the table is 30 inches. ANSWER

GUIDED PRACTICE for Example 3 The expressions 8y° and ( 9y – 15 )° represent the measures of two of the angles in the table in Example 3. Find the measure of an angle. 3. 120o ANSWER

Daily Homework Quiz 1. Draw a convex hexagon. ANSWER 2. This figure shows the tiles on a kitchen floor. What type of polygon are the tiles? Are they regular polygons? quadrilaterals ; not regular ANSWER

Daily Homework Quiz 3. This figure is a regular polygon. Find the length of each side. ANSWER 16 cm