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LESSON PLAN (Linda Bolin) Lesson Title: Angle Attributes and Measures Course: Math 7 Date Utah State Core Content and Process Standards: 4.1c Draw label and describe attributes of angles, 4.2b Measure angles Lesson Objective(s): Students will describe angle attributes and will be able to measure and estimate measures for angles. Enduring Understanding (Big Ideas): Essential Questions: Angles are a basic idea in geometric Where are examples of angles found in the thought and measurement real-world? How can I describe the attributes for an angle? What is the measure for a given angle? Skill Focus: Vocabulary Focus: Recognize attributes of angles angle, vertex, protractor, degree, acute, right, Measure angles obtuse Estimate angle measures Materials: Angle Sort paper Measuring Angles worksheets Measuring angles quiz Classifying Angles song overhead Scissors Protractors Two-Colored Circular manipulative (made with small plastic plates) Paper for foldable Assessment (Traditional/Authentic): Student performance tasks, question responses, Quiz Ways to Gain/Maintain Attention (Primacy): sorting, cooperative learning, manipulative, music, movement, virtual manipulatives-Geoboard Written Assignment: Measuring Angles Angles Foldable Content Chunks Post vocabulary on a Word Wall or board and refer to the vocabulary during the lesson. Lesson Segment 1: Where are examples of angles found or used in the real- world? Guessing game: Tell students you are thinking of a geometric idea and that you will point to some examples of that idea in the room. When they think they might know what the idea you are thinking of is, they may write the idea down. After pointing to several examples that suggest where an angle might be formed, ask for responses. Ask students to describe attributes for some of the angles you pointed to such as where the vertex point might be, or where the line segments are which form the angle. Show the math symbol for angle. Lesson Segment 2: How can I describe attributes of angles? Without giving information have students sort angles by cutting out the cards on the Angle Sort paper. Partners cut and sort, writing the rule for their sort. Then have the partners compare their sorting to another pair. Discuss with class the sort bringing them to the idea that angles can be described by the wideness or openness of the angle. This wideness is the measure of an angle. Remind them that they may have heard words such as acute, right or obtuse when describing angles. Sing this song with the students: Classifying Angles Song (to the tune of Skip To My Lou. Lyrics by Linda Bolin) Use arms to show each as the verse is sung. I’m a little angle. I like me like that. An ACUTE little angle, and I’m not fat. I’m an alligators mouth or a witches hat. I’m ACUTE. I’m less than 90. I’m a RIGHT angle, and I look square. Look for a corner, and I’ll be there. I’m a flag or a present. I’m everywhere. I’m just RIGHT. I’m exactly 90. I’m rather large, so I have pride. I’m an OBTUSE angle. I’m big inside. I’m a reclining chair or a door open wide. I’m OBTUSE. I am more than 90. Have students use Two-color Circular manipulative to show attributes such as acute, obtuse and right as you ask them to. (A two-color manipulative can easily be made to allow the students to demonstrate angles. Make a cut in two different colored small plastic plates from the circumference to the center of the plate. Slide the two plates together at the cut.) Have students re-sort the angles into acute, right and obtuse categories (if they did not originally do so) and write the category on the back of the card. Lesson Segment 3: What is the measure for a given angle? Use the “Measuring Angles” investigation worksheet and protractors to become more familiar with the protractor and to measure angles. Practice: Make a three column foldable (as shown below). The back side of the foldable can be labeled “Measuring and Classifying Angles”. Have students use their protractors to measure each of the angles from the sort cards. Then have them use the protractor to sketch the angles in the appropriate column on the Foldable and label the measure of each angle. Acute <’s Obtuse <’s Right <’s Using the Two-Color Circular manipulative again, call out angle degrees and have the students rotate the sections of their plate to show an estimation for the measure. Students will enjoy practicing angles measures using a virtual protractor by going to this site: http://www.kidport.com/Grade6/Math/MeasureGeo/MeasuringAngle s.htm Assessment: Have students complete the quiz attached Angle Sorting Cut the angle cards apart. Sort them into three categories and write the rule for each category. Your categories can’t refer to angle positions such as up- side-down, left or right. 1 2 3 4 5 6 7 8 9 10 11 12 Measuring Angles Name_____________________ C B A 0˚ 1) What is an angle? Use the circle drawing to help you understand and explain. 2) How can angles in circle A be the same size as angles in circle B and C when they look wider? 3) When you turn around in a complete circle, you have traveled 360 degrees. Degrees are used to label the distance of a turn. Use a colored pencil to trace the line and label the degrees to show where each of the following turns would stop. Begin at 0˚ each time. Each line represents a turn of 15 degrees. The degrees are the measure of the angle. A. A 15˚ turn B. A 30˚ turn C. A 45˚ turn D. A 90˚ turn E. A 120˚ turn F. A 180˚ turn G. A 210˚ turn H. A 270˚ turn I. A 315˚ turn J. A 360˚ turn C B A 4) Look at a protractor. How is a protractor similar to the circle above? How is it different? 5) Find the mark on your protractor that would represent the center of the circle. Where is that mark? This is the vertex point mark. 6) Find the mark on your protractor that would represent 0˚. Where is the 0˚ mark? 7) Find the mark on your protractor that would represent 180˚. Where is the 180˚ mark? 8) Each angle sketched below represents a turn. Place your protractor so the center mark is on the vertex of an angle. Line one of the segments up pointing to the 0˚ mark. Now find the mark where the other line segment is pointing. How many degrees is the angle? Name __________________ Measuring Angles 1. Label 0° and 180° on this protractor. 2. Label “vertex” where the protractor will be placed on the angle vertex point. 3. Sketch and label where a ray forming a 120° angle might pass through. 4. Sketch a 45° angle in the space below the protractor. 5. Where in this room would you see: An acute angle? A right angle? An obtuse angle?

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posted: | 11/18/2010 |

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