# Geometry Solve real life and mathematical problems involving angle measure, area, surface area and volume.

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2 points, and the percent of students that scored at standard on the task. Related materials, including the scoring rubric, student work, and discussions of student understandings and misconceptions on the task, are included in the task packet. Grade Level Year Total Points Core Points % At Standard % 2012 Noyce Foundation

3 41

4 42

5 Pizza Crusts Rubric The core elements of performance required by this task are: find areas and perimeters of rectangular and circular shapes in a practical context Based on these, credit for specific aspects of performance should be assigned as follows 1. Gives correct answers: A: 20 inches and shows work such as: 5 x 4 B: 24 inches and shows work such as: 8 x 2 plus 4 x 2 C: 28.3 inches accept and shows work such as: 9 x! = Partial credit Three correct answers no work shown 2. (a) Gives correct answer: 24 inches (b) Labels a rectangular pizza with dimensions such as: 12 x 3 = 36 This has a perimeter of 30 inches. 9 x 4 = 36 This has a perimeter of 26 inches. 3. Gives correct answer: 21.4 inches (accept 21 inches) Gives correct explanation such as: If!r 2 = 36 r = 3.4 C=! x 2 x 3.4 = 21.4 points (1) section points 3 3 Partial credit Finds radios r = 3.4 (1) 2 Total Points 8 43

7 Look at student answers for part 3. How many students put: 21 Did not attempt What kind of experiences have students had working with circles? Can you identify the misconceptions that led to some of these errors? How can you give students tasks that increase their thinking about the relationships involved? 45

8 Looking at Student Work on Pizza Crusts Student A shows work clearly, even giving an alternative strategy for 1a. Read the explanation in part three for finding the circumference. How is this different from just stating the procedures? When is it important to talk to students about significant digits or level of accuracy? In this context, is inches an appropriate answer? Why or why not? Student A 46

9 Student A, continued 47

10 Notice the difference between the explanation in given by Student B and Student A. What do you think is the purpose of an explanation? What do you value in students responses and how do you communicate that to students? Student B Student C has the correct answer for part 3, which is clearly not a random answer. In looking at the work above, the r 2 is shown, 11.5, as well as the radius, 3.38, and the diameter, 6.8. But has the student communicated how he figured it out? Why or why not? Student C 48

11 Student D draws out the units to verify the area and find the perimeter. Because the diagram is not drawn to scale, the units for length and width appear to be different sizes. In part three the student confuses this round pizza with the pizza in part 1. What are some of the other errors in thinking? Assuming that 4.5 inches was the radius, how might labeling have helped the student realize what the 8 represented and why the 8 isn t a final answer? Student D 49

12 Student E has a common misconception that a square and a circle with the same area should have the same distance around the outside. What tasks can you design to help students confront that misconception and discover this relationship for themselves? Student E 50

13 Student F answers all the parts of the task dealing with quadrilaterals correctly. However the student has difficulty with understanding circles and circle measurement. She confuses area and circumference in part 1. In part 3 the student solves correctly for the radius, but does not take the next steps to find circumference. Student F 51

14 Student G makes the common error of confusing area and perimeter in part 2a. Although the student seems to know the difference between the two and can use them to design rectangles to meet all the constraints in 2b. In part 3 the student uses the area as a diameter measure. Do you think the student needs work with composing and decomposing diagrams? What might be next steps for this student? Student G 52

15 Student H also draws in the units to find the perimeter in part 2b. However, for both rectangles the area is 32 sq. in. instead of 36 square in. In part 3 the student has confused finding the square root with division. In trying to find the circumference the student has used r 2 for 2 in the diameter. How might showing the substitution have helped the student? What experiences have your students had with finding square roots? Do you think they understand in a deeper way than a button on the calculator? What is the underlying idea that you want students to understand about square roots? Student H 53

16 What is the misconceptions might Student I have about squares and square roots and/or radius and diameter? If this were your student, what questions might you want to ask? Student I 54

17 Student J treats all geometric shapes as squares for finding the perimeter. The thinking stays consistent even in part 3. What does it take to help shake a student from a misconception? Notice that the student confuses area and perimeter in part 2b and just gives a perimeter of 36in. with no dimensions. Student J 55

18 Student K tries to find the area of all the pizzas in part 1 instead of the perimeter. Notice that the student doubles the diameter to find radius, instead of halving. In part 2 the student finds the length of one edge instead of the total length of the edge. In part 3 the student does a lot of brainstorming with! in attempt to find the circumference. What has the student found instead? How might labels or a diagram help the student think about the problem? 56

19 7 th Grade Task 3 Pizza Crusts Student Task Core Idea 4 Geometry and Measurement Find areas and perimeters of rectangular and circular shapes in a practical context. Apply appropriate techniques, tools, and formulas to determine measurements. Based on teacher observation, this is what seventh graders knew and were able to do: Find the perimeter of a square and rectangle Work backwards from the area of a square to the perimeter Areas of difficulty for seventh graders: Distinguishing between area and perimeter in a practical context Understanding radius and diameter when solving a problem Distinguishing between area and circumference in a practical context Working backwards Finding square roots Designing a rectangle with a given area Strategies used by successful students: Labeling answers or making diagrams to show what was needed Skills at transforming equations to work backwards Writing equations and showing substitution 57

20 The maximum score available for this task is 8 points. The minimum score for a level 3 response, meeting standards, is 4 points. More than half the students, 59%, could calculate the perimeter of a square and a rectangle and show their work. About 1/4 of the students could find perimeter and circumference for the shapes in part 1. They could also work backwards from the area of a square to its perimeter and design a rectangle with a given area, show the dimensions, and find the perimeter for their rectangle. Less than 5% of the students could meet all the demands of the task including working backwards from the area to the circumference of the circle. Almost 29% of the students scored no points on this task. More thane 90% of the students with this score attempted the task. 58

21 Pizza Crusts Points Understandings Misunderstandings 0 90% of the students with this score attempted the task. Many students found area instead of perimeter in part one of the task. Many students lost points for not showing their work. Some students tried to multiply the length by 4 to find the perimeter of a 2 Students could find the perimeter of a square and a rectangle and show their work. 4 Students could find the perimeter for squares and rectangles, given the dimensions or working backwards from the area. 6 Students could find the perimeter for squares and rectangles, given the dimensions or working backwards from the area. They could also design a rectangle with a given area, give the appropriate dimensions and calculate the area. 8 Students could find the perimeter given the dimensions or working backwards from the area. They could also design a rectangle with a given area, give the appropriate dimensions and calculate the area. They could also work backwards from the area to find the circumference of a circle. rectangle. Students had difficulty finding the circumference of the circle. 5% thought the circumference was 9 in. (the same as the diameter). 6% multiplied the diameter by 2 (confusing diameter and radius). 3% continued the pattern of 1A, multiplying by 4. 17% of the students put the length of the side, 6 in., instead of the total length of the crust. 15% of the students divided the area by 4, probably confusing area with perimeter. 5% thought the perimeter was 36, the same as the area. Students also had trouble designing rectangles with an area of 36. Many students designed rectangles with an area of 32 and gave the dimensions for those rectangles. A few students gave 4 different side lengths for a rectangle. Some students gave perimeters with a length of 36 inches. Students had difficulty working backwards from the area of a circle to the circumference of the circle. Some students, 5%, stopped with just the r 2, % used the 36sq. in. as a diameter to calculate the circumference. Almost 20% did not attempt this part of the task. 59

22 Implications for Instruction Students at this grade level need frequent opportunities to compose and decompose shapes. They should be comfortable making and labeling diagrams to help them identify what they know and what they need to find. Becoming diagram literate also involves being able to put measurements to the different dimensions. In the pizza crust problem, students often confused radius, diameter, and circumference. Being able to track the different numbers in the diagram, might help students to think about what they are calculating. Student A has a good strategy of identifying what is found from each calculation. I am using this formula to find the radius. Learning to articulate thinking and purpose of calculations in this way helps students in solving multi-step problems. Students should be comfortable working formulas and also solving them backwards. So knowing that students can find the perimeter or area, can they work backwards to find the dimensions? If students know the area of a circle, can they find the circumference? Lessons should be designed to help students learn and understand the process of doing and undoing. This is a significant skill for building algebraic thinking. Many students had the misconception that squares, rectangles, and circles with the same area will have the same perimeter. Students should be exposed to a variety of activities that help them develop ideas about what happens to the area of different shapes with the same perimeter or what happens to the look of shapes if the area stays the same and the perimeter is changed. After doing a series of explorations, students should start to develop generalizations around these relationships. With modern technology, it may not be important for students to know the algorithm for calculating square roots. However, students need to have an understanding of the big idea of square roots and the ability to make a reasonable estimate for square roots. Geometry provides a rich context for exploring this idea, using circle calculations or Pythagorean Theory. Students should understand the big idea and also when to apply it. This might be an interesting topic for exploring in number talks. 60

23 Ideas for Action Research Looking at student work: Often when planning remediation or helping students who are behind, teachers think about the students who are almost there. What are the few steps they need to be successful? But what is it that the students who are at the lowest end of the spectrum need? How are their issues different? Sit down with colleagues and examine the following pieces of student work. Consider the following questions: 1. What are the strengths, if any, that the student has? What are the concepts the students understand about the situation? How might these strengths be used to help build their understanding of the whole situation? 2. How did students use representations? Were the representations accurate? Why or why not? What would have helped the student to improve their representation? 3. What misunderstandings does the student have? What skills is the student missing? What does this suggest about a specific course of action to help this student? 4. How are the needs of each of these students the same or different? After your have carefully looked at each piece of student work, see if you can devise a plan of experiences/ discussions/ tools that might help these students to make more sense of these situations. While you don t have these exact students in your class, each member of the group will probably have students with similar misunderstandings. Identify students who you think are low and plan different approaches for attacking the problems outlined here. Have each person in the group try out a different course of action and report back on the how the lesson or series of lessons effected the targeted students. See if you can all use some similar starting problems and bring work of the students to share. What types of activities or experiences made the most noticeable improvement in student work? 61

24 Alice 62

25 Alice, part 2 63

26 Betty 64

27 Carl 65

28 Dean 66

29 67

30 Edgar 68

31 Fiona 69

32 Developing Diagram Literacy To work on some of the big ideas of diagram literacy, you might have students work with the MARS tasks: Grade Writing Desk, Grade London Eye, or Grade Pipes. When processing the task, ask students to explain how they used the diagram to help them think about the task. What did they label and why? See if they can explain the purpose of each calculation. Students need to start exploring relationships with composite shapes. Have students reason with problems like finding the area and perimeter of these shapes: 70

33 Students should also work with a variety of composite shapes involving circular shapes, such as the ones below: Problems taken from: Primary Mathetmatics 6B and 4A, Singapore. 71

### G C.3 Construct the inscribed and circumscribed circles of a triangle, and prove properties of angles for a quadrilateral inscribed in a circle.

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