MATHEMATICS CARNIVAL: A VEHICLE FOR ALL TO LEARN CCSSM- GEOMETRIC CONCEPTS!*
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1 MATHEMATICS CARNIVAL: A VEHICLE FOR ALL TO LEARN CCSSM- GEOMETRIC CONCEPTS!* Prof. Vivian La Ferla, ED.D Professor of Mathematics and Computer Science and Educational Studies Rhode Island College Providence, Rhode Island National Council of Teachers of Mathematics (NCTM) 2016 Annual Meeting and Exhibition San Francisco, California April 14, 2016 Moscone 2016 National Council of Teachers of Mathematics 2016 April 14th V. La Ferla 1
2 OUTLINE FOR TODAY 1. Introduction 2. Carnival Miras and Funny Mirrors Understanding reflections 3. Spinning for Transformations Coordinate Geometry reflection translation rotation Spin the wheels for transformations 4. Ferris Wheel Math rotation and other geometric understandings 5. Enlarge the Carousel-dilation 6. Analyze Three-Dimensional Solids Using K nex 7. Using the TI-inspire to study transformational geometry National Council of Teachers of Mathematics 2016 April 14th V. La Ferla 2
3 RATIONALE Understand congruence and similarity using physical models, transparencies, or geometry software. CCSS.MATH.CONTENT.8.G.A.1 Verify experimentally the properties of rotations, reflections, and translations: CCSS.MATH.CONTENT.8.G.A.2 Understand that a two-dimensional figure is congruent to another if the second can be obtained from the first by a sequence of rotations, reflections, and translations; given two congruent figures, describe a sequence that exhibits the congruence between them. CCSS.MATH.CONTENT.8.G.A.3 Describe the effect of dilations, translations, rotations, and reflections on two-dimensional figures using coordinates. CCSS.MATH.CONTENT.8.G.A.4 Understand that a two-dimensional figure is similar to another if the second can be obtained from the first by a sequence of rotations, reflections, translations, and dilations; given two similar two-dimensional figures, describe a sequence that exhibits the similarity between them. National Council of Teachers of Mathematics 2016 April 14th V. La Ferla 3
4 Experiment with transformations in the plane CCSS.MATH.CONTENT.HSG.CO.A.1 Know precise definitions of angle, circle, perpendicular line, parallel line, and line segment, based on the undefined notions of point, line, distance along a line, and distance around a circular arc. CCSS.MATH.CONTENT.HSG.CO.A.2 Represent transformations in the plane using, e.g., transparencies and geometry software; describe transformations as functions that take points in the plane as inputs and give other points as outputs. Compare transformations that preserve distance and angle to those that do not (e.g., translation versus horizontal stretch). CCSS.MATH.CONTENT.HSG.CO.A.3 Given a rectangle, parallelogram, trapezoid, or regular polygon, describe the rotations and reflections that carry it onto itself. CCSS.MATH.CONTENT.HSG.CO.A.4 Develop definitions of rotations, reflections, and translations in terms of angles, circles, perpendicular lines, parallel lines, and line segments. CCSS.MATH.CONTENT.HSG.CO.A.5 Given a geometric figure and a rotation, reflection, or translation, draw the transformed figure using, e.g., graph paper, tracing paper, or geometry software. Specify a sequence of transformations that will carry a given figure onto another. National Council of Teachers of Mathematics 2016 April 14th V. La Ferla 4
5 Understand congruence in terms of rigid motions CCSS.MATH.CONTENT.HSG.CO.B.6 Use geometric descriptions of rigid motions to transform figures and to predict the effect of a given rigid motion on a given figure; given two figures, use the definition of congruence in terms of rigid motions to decide if they are congruent. CCSS.MATH.CONTENT.HSG.CO.B.7 Use the definition of congruence in terms of rigid motions to show that two triangles are congruent if and only if corresponding pairs of sides and corresponding pairs of angles are congruent. CCSS.MATH.CONTENT.HSG.CO.B.8 Explain how the criteria for triangle congruence (ASA, SAS, and SSS) follow from the definition of congruence in terms of rigid motions. National Council of Teachers of Mathematics 2016 April 14th V. La Ferla 5
6 Make geometric constructions CCSS.MATH.CONTENT.HSG.CO.D.12 Make formal geometric constructions with a variety of tools and methods (compass and straightedge, string, reflective devices, paper folding, dynamic geometric software, etc.). Apply geometric concepts in modeling situations CCSS.MATH.CONTENT.HSG.MG.A.1 Use geometric shapes, their measures, and their properties to describe objects CCSS.MATH.CONTENT.HSG.MG.A.3 Apply geometric methods to solve design problems National Council of Teachers of Mathematics 2016 April 14th V. La Ferla 6
7 Which Standards for Mathematical Practice are addressed? CCSS.MATH.PRACTICE.MP1 Make sense of problems and persevere in solving them. CCSS.MATH.PRACTICE.MP2 Reason abstractly and quantitatively. CCSS.MATH.PRACTICE.MP3 Construct viable arguments and critique the reasoning of others. CCSS.MATH.PRACTICE.MP4 Model with mathematics. CCSS.MATH.PRACTICE.MP5 Use appropriate tools strategically. CCSS.MATH.PRACTICE.MP6 Attend to precision. CCSS.MATH.PRACTICE.MP7 Look for and make use of structure. CCSS.MATH.PRACTICE.MP8 Look for and express regularity in repeated reasoning. National Council of Teachers of Mathematics 2016 April 14th V. La Ferla 7
8 CARNIVAL MIRAS AND FUNNY MIRRORS PART I Use the Mira to reflect several shapes below over one reflection line. Place the Mira on the line of reflection with the beveled edge facing the shape and look through the Mira at an angle and draw its reflection. National Council of Teachers of Mathematics 2016 April 14th V. La Ferla 8
9 National Council of Teachers of Mathematics 2016 April 14th V. La Ferla 9
10 2.Label the pre-image A,B,C,D and their image A,B C,D 3. What do you notice about the reflection in relation to the pre-image? 4. Connect AA, BB, CC a. Is there a relationship between AA and the line of reflection? b. Is there a relationship between BB and the line of reflection? Is it different that AA or the same? Explain. c. Is there a relationship between AA, BB, CC? National Council of Teachers of Mathematics 2016 April 14th V. La Ferla 10
11 5.When a shape is reflected over a line, some properties hold true for any shape. Analyze these properties by answering the following questions: Does the shape change into another shape when it is reflected or does it stay the same? Is the shape the same size? Examine the orientation of the shape. Did it stay the same or change? 6. What happens when a point is on the line of reflection? 7. What happens when a point is not on the line of reflection? 8. Can you write a definition for reflections? National Council of Teachers of Mathematics 2016 April 14th V. La Ferla 11
12 Note: the notation for a reflection of a shape over line, m, is r m shape A = A PART II 1.Use the Mira to perform the series of reflections: r m ( ABC) and label ΔA B C then r n A B C = A"B"C" where m ll n National Council of Teachers of Mathematics 2016 April 14th V. La Ferla 12
13 2. What do you notice about the relationship between the pre-image and the image when the lines of reflection are parallel? 3. Connect AA, BB and CC. Measure the distances and angle measures and record in the chart below. Length Length measurement Angle Angle measure AA m CGH A A m HGI BB m GIJ B B CC C C Distance between m and n 4. By comparing values, can you make any conjectures? National Council of Teachers of Mathematics 2016 April 14th V. La Ferla 13
14 5.Use the Mira to perform the series of reflections when the lines of reflection s and t intersect. r S ( DEF) and label ΔD E F then r t D E F = D"E"F" 6. What do you notice about the relationship between the pre-image and the image when the lines of reflection intersect? 7.Connect DD, EE and FF and complete the chart below by measuring the listed angles. ANGLE ANGLE MEASURE ANGLE m MOK m KOL m EKO m OKE m EKE National Council of Teachers of Mathematics 2016 April 14th V. La Ferla Do you notice any relationships between the angles you measured and the angles between the interesting lines?
15 PART III: FUNNY MIRRORS Use the mylar paper, place is over the curved line below and view the reflection. What do you notice? National Council of Teachers of Mathematics 2016 April 14th V. La Ferla 15
16 What happens when the curve gets narrower? What happens when the curve gets wider? National Council of Teachers of Mathematics 2016 April 14th V. La Ferla 16
17 4.What happens if you place the funny mirror on the convex surface? 5. Play around and make your own curve and explains what happens. 6. How can you curve the mylar mirror so that you obtain many faces? How many faces can you get? 7. Do the properties of reflection of preservation of distance, angle measure and shape hold for the mylar mirror? 8. Can you draw any conclusions? National Council of Teachers of Mathematics 2016 April 14th V. La Ferla 17
18 SPIN FOR TRANSFORMATIONS National Council of Teachers of Mathematics 2016 April 14th V. La Ferla 18
19 DIRECTIONS 1. COMPLETE THE PRELIMINARY ACTIVITIES ON RECOGNIZING PATTERNS THAT ARISE IN THE COORDINATES UNDER A TRANSFORMATION. YOU SHOULD BE ABLE TO RESPOND TO THE FOLLOWING QUESTIONS. HOW DOES A SHAPE MOVE UNDER A TRANSLATION? AND WHAT HAPPENS TO THE CORRESPONDING COORDINATES AFTER A TRANSLATION? HOW DOES A SHAPE MOVE UNDER A REFLECTION? AND WHAT HAPPENS TO THE CORRESPONDING COORDINATES AFTER A REFLECTION? HOW DOES A SHAPE MOVE UNDER A ROTATION OF 90? AND WHAT HAPPENS TO THE CORRESPONDING COORDINATES AFTER A ROTATION ABOUT (0,0)? National Council of Teachers of Mathematics 2016 April 14th V. La Ferla 19
20 SPINNING FOR TRANSFORMATIONS 1. SELECT A GRID WITH A SHAPE ON IT. 2. SPIN THE LEFT HAND SPINNER FOR A LETTER. 3. FIND THE CARD WITH THE LETTER AND PERFORM THE TRANSFORMATION. MAKE SURE YOU LABEL THE COORDINATES OF THE VERTICES (A,B,C, etc.). 4. THEN PERFORM THE TRANSFORMATION ON THE TRANSFORMED SHAPE OBTAINED BY SPINNING THE SECOND SPINNER. THIS IS CALLED A SEQUENCE OF TRANSFORMATIONS. MAKE SURE YOU LABEL THE COORDINATES (A,B,C, etc). National Council of Teachers of Mathematics 2016 April 14th V. La Ferla 20
21 A reflection is shown on the coordinate grid below of ΔABC to ΔA B C. The reflection over the line m is given below. r m ABC=ΔA'B'C' is the notation for a reflection National Council of Teachers of Mathematics 2016 April 14th V. La Ferla 21
22 Perform a translation in the coordinate grid below of ABCD to A B C D. The translation vector shown moves the triangle horizontally, h units, and vertically, k units, in a direction given by the vector. T (h,k) (x+h, y+k) is the notation Complete the chart below and draw the translation and write the appropriate notation for this translation. Coordinates of preimage (1,2) (4,2) (2,5) Coordinates of image 1. Do you notice a pattern between the coordinates of the pre-image and the coordinates of its image? 2. Describe in your own words the relationship between the translation vector and the image? 1. Label the parallelogram ABCD and its image A B C D. 2. Draw AA, BB,CC,DD and measure the lengths. What do you notice? (5,5) National Council of Teachers of Mathematics 2016 April 14th V. La Ferla 22
23 National Council of Teachers of Mathematics 2016 April 14th V. La Ferla 23
24 ON THE GRID BELOW IS AND EXAMPLE OF A ROTATION OF 90 ABOUT THE CENTER (0,0) OF ΔABC TO ΔA B C. COMPLETE THE TABLE WITH COORDINATES FOR EACH VERTICE AND ITS ROTATIONS BELOW. POINT COORDINATES IMAGE COORDINATES A (0,0) A B (3,0) B C (3,4) C National Council of Teachers of Mathematics 2016 April 14th V. La Ferla 24
25 CHALLENGE COORDINATE GEOMETRY PROOFS 1. TO DO THESE PROOFS, YOU WILL NEED SOME ALGEBRA MIDPOINT FORMULA-FOR MEDIAN DISTANCE FORMULA-FOR LENGTHS OF SIDES SLOPE FORMULA-TO SHOW PARALLEL LINES National Council of Teachers of Mathematics 2016 April 14th V. La Ferla 25
26 PROOF #1: DIAGONALS OF A RECTANGLE ARE EQUAL National Council of Teachers of Mathematics 2016 April 14th V. La Ferla 26
27 National Council of Teachers of Mathematics 2016 April 14th V. La Ferla 27
28 National Council of Teachers of Mathematics 2016 April 14th V. La Ferla 28
29 National Council of Teachers of Mathematics 2016 April 14th V. La Ferla 29
30 National Council of Teachers of Mathematics 2016 April 14th V. La Ferla 30
31 National Council of Teachers of Mathematics 2016 April 14th V. La Ferla 31
32 Thank you for your attention! Vivian La Ferla Rhode Island College Providence, RI National Council of Teachers of Mathematics 2016 April 14th V. La Ferla 32
33 Rate this presentation on the conference app! Search NCTM 2016 in your app store or follow the link at nctm.org/confapp to download Join in the conversation! #NCTMannual Download available presentation handouts from the online planner at nctm.org/planner
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