Learning Experience: Angle Circles. When planning, include the following: Models (Concrete Semi-Concrete Semi-Abstract Abstract) Problems/Situations

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1 Learning Experience: Angle Circles When planning, include the following: Models (Concrete Semi-Concrete Semi-Abstract Abstract) Problems/Situations Questions AKS: 40.MD.5 recognize angles as geometric shapes that are formed wherever two rays share a common endpoint and understand concepts of angle measurement 41.MD.5 recognize that an angle is measured with reference to a circle with its center at the common endpoint of the rays, by considering the fraction of the circular arc between the points where the two rays intersect the circle; an angle that turns through 1/360 of a circle is called a "one-degree angle", and can be used to measure angles 42.MD.5 recognize that an angle that turns through "n" one-degree angles is said to have an angle measure of "n" degrees 43.MD.6 measure and draw angles using tools such as a protractor or angle ruler Vertical Alignment: 5 th 39.G.3 demonstrate that attributes belonging to a category of two-dimensional figures also belong to all subcategories of that category (e.g., all rectangles have four right angles and squares are rectangles so all squares have four right angles) 40.G.4 classify two-dimensional figures in a hierarchy based on properties 3 rd 42.G.1 identify, draw, examine, and classify quadrilaterals (including rhombuses, rectangles, squares, parallelograms, and trapezoids) 43.G.1 compare and contrast the attributes of quadrilaterals, and categorize quadrilaterals based on shared attributes Standards for Mathematical Practice: 1. Make sense of problems and persevere in solving them. 2. Reason abstractly and quantitatively. 3. Construct viable arguments and critique the reasoning of others. 4. Model with mathematics. 5. Use appropriate tools strategically. 6. Attend to precision. 7. Look for and make use of structure. 8. Look for and express regularity in repeated reasoning.

2 Materials: 2- Hefty Styrofoam plates per student (or generic with 36 thumbprints along the edge) Glue stick Scissors Pencil Sharpie marker Ruler inch colored paper circle Vocabulary: Angle Ray Endpoint Degree of an angle Acute Obtuse Right Protractor Center of a circle Radius Diameter Essential Question: How do we recognize, measure, and name angles? Activating Strategy: Read: Sir Cumference and the Great Knight of Angleland by Cindy Neuschwander. Find various objects around the room that contain small angles (acute), right angles, and large angles (obtuse). Recognize that there can be several sizes of acute and obtuse angles and they are name by comparing them to a right angle (a perfect corner).

3 Instructional Activity: 1) Glue the colored circle in the center of one of the plates. 2) Use a ruler to find the center of the plate and mark it with a pencil. 3) Stack the two plates together so that the thumbprints are nested on top of each other. 4) Use scissors to make a cut on the edge of one thumbprint to the center of the circle. *It is important that the plates are aligned so that the cut is on the edge of the thumbprint and NOT inside the thumbprint. 5) Separate the plates and number the thumbprints on the white plate starting with the thumbprint immediately to the right of the cut. Count by 10s from 10 to 360 going clockwise. 6) Insert one plate through the other along the cut line. Angles are formed by the 2 cuts (rays) and the center of the circle. Questioning: 1) Can you show me an acute angle? Obtuse? Right? 2) angle look like? Is it acute, right, or obtuse? 3) r obtuse? 4) 5) * 6) protractor? 7) Can you use your protractor to measure the corner of your paper? What other angles can you find to measure with your protractor? 8) Would this protractor have been accurate enough to help Radius find his way through the Labyrinth? 9) How could we make the protractor more accurate?

4 1. Expanding the experience Find equivalent fraction connections. Label common fractions on the plate example: ¼ at Extending the experience Connect to clock. Ex. If the start time is 1:25 and end time is 1:40 how many degrees did the minute hand move on the clock? What fraction of an hour elapsed? Summarizing: Take a piece of paper. Fold it into four pieces. Label A, B, C, D. On the board or chart paper have a circle drawn that looks like protractor. Have 4 questions to answer in their segment. A. Tell how you would use a protractor to measure something. B. C. Tell the angle measure of the point labeled C. (Put a sticky note with a B around 150 D. What is the most important thing you learned about angles by using the plate protractor? Did your plans you include the following? Models (Concrete Semi-Concrete Semi-Abstract Abstract) Problems/Situations

5 Questions

Learning Experience: Angles and Circles. When planning, include the following: Models (Concrete Semi-Concrete Semi-Abstract Abstract)

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