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Review: Lesson 1-3 Mini-Quiz Class Greeting Objective: The students will learn how to measure angles and how to classify them according to the angle. Chapter 1 – Lesson 4 Angle Measure Vocabulary • Degree The unit used to measure angles is the degree One degree is 1/360th of a circle Vocabulary • Ray A ray is part of a line. It has one endpoint and extends forever in one direction. P Q Naming Rays The name of a ray shows the endpoint first and then any other point on the ray P This ray is PQ (not QP!) Q Angles an angle is formed by two non-collinear rays with the same endpoint the rays are called the sides of the angle the endpoint of the rays is the vertex of the angle Angles Opposite Rays Two A point raysonwith a line a common is the endpoint endpoint of that two form rays a 180 ondegree that line angle called areopposite called Opposite rays Rays. P Q R Here the opposite rays are QP and QR A 180 degree angle is called a Straight Angle. Angles Divide the Plane • An angle in a plane divides it into 3 parts: – Points on the angle – Points in the interior of the angle – Points in the exterior of the angle Points A,D & E are on the angle Points C & B are in the interior of the angle Points F & G are in the exterior of the angle Name all angles that have B as a vertex. Answer: 5, 6, 7, and ABG Name the sides of 5. Answer: and or are the sides of 5. Write another name for 6. Answer: EBD, FBD, DBF, and DBE are other names for 6. Classifying Angles An angle with measure = 90 is called a right angle Classifying Angles An angle with measure < 90 is called an acute angle Classifying Angles An angle with 180 > measure > 90 is called an obtuse angle Measure TYV and classify it as right, acute, or obtuse. TYV is marked with a right angle symbol, so measuring is not necessary. Answer: is a right angle. Measure WYT and classify it as right, acute, or obtuse. Answer: = is an obtuse> angle. is an obtuse angle. Measure TYU and classify it as right, acute, or obtuse. Answer: Use a protractor to find that m is an acute angle. Lesson Summary: Objective: The students will learn how to measure angles and how to classify them according to the angle. Preview of the Next Lesson: Objective: The students will learn the Angle Addition Postulate and about different types of angle pairs. Homework Geometry 1-4