Identify each fi gure as a line, a line segment, or a ray. Then, name it using the correct notation. a) M N b) A B c) X Y Solution a) This fi gure has one endpoint and an arrowhead on the other end indicating that it ¡ goes on forever in that direction. This is a ray. Write its name as MN . (Notice that the M must come fi rst because it is the endpoint of the ray.) b) This fi gure is straight and continues forever in both directions. This is a line. Write · its name as AB · or BA . c) This fi gure is straight with two endpoints. This is a line segment. Write its name as XY or YX. EXAMPLE 1 YOU TRY 1 Identify each fi gure as a line, a line segment, or a ray. Then name it using the correct notation. a) C D b) G H c) M N 2 Identify and Classify Angles If we join two rays at their endpoints, we get an angle. The vertex of the angle is the ¡ common endpoint. This angle is formed by joining rays BA ¡ and BC . A B 1 Angle C Vertex An angle is denoted by the symbol . We can name this angle in different ways: Put the vertex in the middle Using only the vertex Using the number label given to the angle ABC or CBA B 1 Note Sometimes two or more angles share the same vertex. In this case, we do not name the angle using only the vertex. 286 CHAPTER 4 Basic Geometry Concepts and Algebra www.mhhe.com/messersmith
messersmith_power_prealgebra_1e_ch4_7_10
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