UNIT PLAN. Grade Level: Unit #: 7 Unit Name: Circles

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1 UNIT PLAN Subject: Geometry Grade Level: Unit #: 7 Unit Name: Circles Big Idea/Theme: The understanding of properties of circles, the lines that intersect them, and the use of their special segments allows students to make connections between the theoretical and actual use of circles in the real world. Culminating Assessment: Circle Folding Activity Unit Understanding(s) Students will understand The properties of a circle and the terminology of a circle. The properties of lines that intersect circles are unique. When and how to use the central angle properties. When and how to use the inscribed angle properties. When and how to use the properties of arcs. Unit Essential Question(s): How are the properties of the component parts of a circle (including radii, diameters, chords, sectors, arcs, and segments) used to solve problems? How are the properties of lines that intersect circles (including two secants, two tangents, secant and tangent) used to solve problems? How do you solve problems using the properties of central angles? How do you solve problems using the properties of inscribed angles? How do you solve problems using the properties of arcs? South Carolina Academic Standards: G-1.1 Formulate and demonstrate an understanding of the axiomatic structure of geometry by using undefined terms, definitions, postulates, theorems, and corollaries. G-1.2 Communicate knowledge of geometric relationships by using mathematical terminology appropriately. G-1.4 Conjecture by using a variety of tools such as concrete models, graphing calculators, spreadsheets, and dynamic geometry software. G-1.7 Understand the historical development of geometry. G-1.8 Connect geometry with other branches of mathematics. G-1.9 Demonstrate an understanding of how geometry applies to real world contexts (including architecture, construction, farming, and astronomy). G-1.10 Demonstrate an understanding of geometric relationships (including constructions through investigations by using a variety of tools such as 1

2 straightedge, compass, Patty Paper, dynamic geometry software, and handheld computing devices). G-5.5 Apply the properties of the component parts of a circle (including radii, diameters, chords, sectors, arcs, and segments) to solve problems. G-5.6 Apply the properties of lines that intersect circles (including two secants, two tangents, and a secant and a tangent) to solve problems. G-5.7 Apply the properties of central angles, inscribed angles, and arcs of circles to solve problems. Interim Assessment (formative) Quizzes/Tests Observations Question and answer Journals Class discussion Board work Group activities Key Criteria (to meet the standard/rubric) See attached rubric 2

3 Culminating Assessment Unit 8 Magic Circles Creating a Truncated Tetrahedron. I acquired this activity during a workshop for USD 259 in Wichita, KS called "Monday Night Math". I have taught this to classes from third grade to the college level. This activity helps build, reinforce and can even be used to introduce vocabulary in math. This activity can be done with various grade levels by simply altering the vocabulary to make it appropriate to the skill level you are working with. This is a great listening / fine motor skill activity. (The key vocabulary words are in parenthesis.) Materials: one 7 inch paper circle or a coffee filter, pencil, & ruler Look at the shape you are holding. Describe it. It is a (circle). Look at the outer edge of you circle. What is the distance around the outside of the circle called? (Circumference) Fold your circle directly in half and crease it well. Open the circle, the crease you made is the (diameter) of the circle. Hold the circle at the ends of the crease. Fold your circle in half again, but this time match up the end points of the crease. Open your circle, is this also a diameter? How do you know? Do the lines (intersect)? Yes. Is there something special about the way these lines intersect? They create four 90 o (or right) angles. This special type of intersection is called (perpendicular). Place a dot, no bigger than the width of a pencil, at the point where the creases connect. This is called the (center) of the circle. Using your pencil, trace one of the lines from the center to the edge of the circle. This line from the center is called a (radius). Fold in one of the outer, curved edges of the circle until it just touches the dot in the middle. Crease it well. Open the fold and look at the crease you just made. Is it a diameter? Is it a 3

4 radius? Why or why not? This line is called a (chord). Look at the curved part of the circle between the points where this line touches the outside of the circle. This is called an (arc). Can you find other arcs on your circle? Take the opposite side of your circle and fold it so that the curved part just touches the center and the bottom forms a perfect point. Your circle will look like an ice cream (cone). Crease it well. Fold the top of your ice cream cone down until the curved part just touches the center of the circle. The top corners should make perfect points, crease well. Now describe the shape you have. (Triangle) Do you notice anything special about this triangle? Look at all of the (angles), they are the same as well as all of the sides are the same. This triangle is called an (equilateral and/or acute triangle). You could also use (equiangular). Fold the new triangle in half by matching up two of the points. Crease well. The new cease splits the triangle in half, this line is called the (height or altitude). Can you figure out anything else about this triangle? It is a (right triangle). Open the right triangle up to the equilateral triangle. Take the top corner of the big triangle and fold it. By folding along the crease of the height you can match the top point up to the bottom crease line. On the inside you will now see three smaller triangles. Turn the paper over so that you do not see the creases. What is this shape called? Since it has four sides it can be classified as a (quadrilateral). Since this quadrilateral has two sides that are (parallel) and two that are not it is also called a (trapezoid). Turn it back over so that you now see all of the creases. Fold one of the outer triangles in so that it lies directly on top of the center triangle. Turn it back over and describe the shape you now see. It is not a kite, kites fly in the sky. It is not a diamond, I wear diamonds on my fingers. In mathematics this shape is called a (rhombus). Turn your shape back over and fold the last outer triangle over onto the center one again. You should now have a smaller equilateral triangle. Open up all three of the small triangles. Bring the three loose points together so that you now have a (pyramid). At this point you can discuss (faces) (edges) 4

5 (points) (vertices) (base) and the fact that this is a (triangular pyramid) and not a squared pyramid like those built in Egypt. Open your pyramid back up to the large equilateral triangle. Fold over one of the points so that it just touches the dot in the middle. What shape have you re-created? The trapezoid though not the traditional shape it can still be identified as a trapezoid. Fold one more of the points in so that it just touches the dot in the middle. Now what shape do you have? (Pentagon) Even though it is not the traditional shape you are accustomed to, it still has five sides, therefore it is still classified as a pentagon. Now fold in the last point. What shape is it now? (Hexagon) Discuss (plane) figures. Turn to the other side and fit one of the corners into a flap on the opposite side of the triangle. You may have to try more than one. Choose the one that makes the best fit. Slide the last corner under/inside the others. You have now created a (truncated tetrahedron)! For any of the shapes during this activity you can have students calculate the surface area, volume, perimeter and/or area. Contributed 5

6 Rubric This is a listening activity to sum up all terms learned in Geometry The teacher is observing and assessing as the students perform the activity. 6

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