# Practice Test Answer and Alignment Document Mathematics: Geometry Performance Based Assessment - Paper

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1 The following pages include the answer key for all machine-scored items, followed by the rubrics for the hand-scored items. - The rubrics show sample student responses. Other valid methods for solving the problem can earn full credit unless a specific method is required by the item. - Unless otherwise stated, students may write any equivalent form when asked to create their own expression, equation, function or model. - In items where the scores are awarded for full and partial credit, the definition of partial credit will be confirmed during range-finding (reviewing sets of real student work). - If students make a computation error, they can still earn points for reasoning or modeling. - Unless otherwise stated, students must define variables when using them in a model. Students that do not define their variables may not be able to earn the top score point. PARCC PBA Paper Assessment: Geometry Mathematics Practice Test - Answer and Alignment Document 1

2 Item Number Practice Test Answer and Alignment Document Answer Key Evidence Statement Keys Integrated Math Alignment Part 1: Non-Calculator 1 B, D, E G-CO G-GPE.6 C G-SRT.1a 4 A G-SRT.6 5 A, E G-SRT. 6 E G-SRT.7-7 A G-SRT.6 Part : Calculator 8 Part A: see rubric Part B: see rubric Part C: see rubric HS.D.-11 Part A: see rubric Part B: see rubric HS.C See rubric HS.D.- 11 A G-SRT.1b 1 0 to 0.0 G-SRT Part A: see rubric Part B: see rubric HS.D.1- Part A: see rubric Part B: see rubric HS.C.18. None Part A: see rubric Part B: see rubric HS.C See rubric HS.C See rubric HS.D.- 18 A, D G-CO.1 1 PARCC PBA Paper Assessment: Geometry Mathematics Practice Test - Answer and Alignment Document

3 #8 Part A Student response includes each of the following elements: The surface area of the roof is approximately 96 square foot Valid work shown The angle consists of two parts the right angle created by the side of the shed, and the top of the rectangular side and the acute angle used to form a right triangle. For a 15 angle, the right triangle of the roof line has an angle of 5 and an adjacent side of 9. Each side of the roof is a rectangle with one side measuring 18 feet and the other side measuring 9 cos5 feet cos5 The area of the roof is approximately 95.5 square feet. PARCC PBA Paper Assessment: Geometry Mathematics Practice Test - Answer and Alignment Document

4 #8 Part B Student response includes each of the following elements: Decision of no with valid reason Valid explanation A 10% decrease in the roof area obtained in Part A is about 56 square feet which means one rectangle would have an area of about 178 square feet If the base of the rectangle remains 18 feet, then one side of the rectangle representing the roof will be 18 feet and the other side wila be 178/18 which is about 9.9 feet or 10 feet. Then, I could form a right triangle to find the angle measure and use the equation cos (x) = 9/9.9 which gives an approximate value of 5. The angle would be about = 115, and this would not meet the minimum requirement of 117. Notes: The decision no can only be awarded 1 point if it is accompanied by a valid reason. It is possible that a wrong surface area in Part A could yield a yes answer in Part B. Such answers should be considered correct if accompanied by a valid reason. PARCC PBA Paper Assessment: Geometry Mathematics Practice Test - Answer and Alignment Document 4

5 #8 Part C Student response includes each of the following elements: Greatest angle of approximately 1.7 Valid work shown The builder s budget means that he can buy at most 11 bundles of shingles Because each bundle covers 5 square feet, the greatest surface area for one side of the roof is 19.5 square feet. This means that the greatest length the side of the roof can be is about 10.7 feet cos(z) = z.6578 Therefore, the angle would need to be less than or less than PARCC PBA Paper Assessment: Geometry Mathematics Practice Test - Answer and Alignment Document 5

6 #9 Part A Student response includes accurate instructions for steps -5. Sample student response: 1 For step, draw any arc centered at point Z. Label the intersections of the arc and the angle point A and point B. For step, draw any arc with a radius greater than half of BZA centered at point A. For step 4, draw an arc centered at point B with the same radius as the arc used in step. Label the intersection of the arcs from step and 4 point C. For step 5, draw a ray through point C with an end point at Z. Student response includes accurate instructions for at least two of the steps based on descriptions to previous steps. #9 Part B Student response includes a full explanation of each of the following elements: Accurate explanation that refers to the use of corresponding parts of congruent triangles and the definition of angle bisector A logical sequence of statements that constitute a valid mathematical explanation or proof 1. AZ BZ [Both segments were drawn with the same compass setting, and all radii of a given circle are congruent.]. AC BC [Both segments were drawn with the same compass setting, and all radii of a given circle are congruent.]. ZC ZC [Reflexive Property of Congruence] 4. AZC BZC [Side-Side-Side Triangle Congruence] 5. AZC BZC. [Corresponding parts/angles of congruent triangles are congruent.] 6. ZC bisects AZB. [definition of angle bisector] 1 Student response includes a partial explanation. PARCC PBA Paper Assessment: Geometry Mathematics Practice Test - Answer and Alignment Document 6

7 #10 Student response includes each of the following 4 elements: Determines the value of x to be about 16 feet Creates a valid equation States assumptions needed to use the equation Valid work shown There is an assumption that the two triangles (the one formed by the billboard and the one formed by the post) are similar and very close to right triangles. x 6 = x = 6 ( 4 41 ) x 16.4 Note: An alternate equation is to let y be the angle formed by the support and the ground. Then y 1 cos 4, and 41 x 6 cos y. Note: Any intermediate rounding should also result in an answer of about 16. Note about assumptions: There is no indication in the description that the triangles are right triangles, although the figure certainly suggests it. Possible assumptions should address this if the Pythagorean theorem or the cosine function is used, such as: There is an assumption that the billboard and the post are both perpendicular to the ground and that the ground is level; or There is an assumption that the billboard and the post are parallel and very nearly perpendicular to the ground, and that the ground is level. Student response includes of the above elements. 1 Student response includes 1 or of the above elements. PARCC PBA Paper Assessment: Geometry Mathematics Practice Test - Answer and Alignment Document 7

8 #1 Part A Student response includes each of the following elements: Correct identification of the shape of the exposed surface as a rectangle Correct area of the rectangle Valid work shown The shape of the exposed surface is a rectangle. The width of this rectangle is the length of one edge of the cube, which is 10 inches. The length of the rectangle, d, is the length of the diagonal of a square face of the cube. To find this length, apply the Pythagorean Theorem. c a b d d d (inches) The length of the diagonal of a face of the cube is approximately 14.1 inches. The area of the rectangle (exposed surface) is square inches. Student response includes of the elements. 1 Student response includes 1 of the elements. PARCC PBA Paper Assessment: Geometry Mathematics Practice Test - Answer and Alignment Document 8

9 #1 Part B Student response includes each of the following elements: Correct conclusion that the volume of clay in the chunk is 500 cubic inches Correct conclusion that the volume of each clay sphere is cubic inches, or approximately.5 cubic inches Correct conclusion that Daniel can make 14 clay spheres, with calculations to support that conclusion The volume of each congruent chunk is half the volume of the entire block. The volume of the cube is (10 inches), or 1,000 cubic inches. So the volume of each congruent chunk of clay is 500 cubic inches. Each sphere will have a diameter of 4 inches and a radius of inches. The volume of 4 each clay sphere will be ( inches), or cubic inches. This is approximately.5 cubic inches. To find the number of spheres that Daniel can make from the chunk of clay, divide the volume of the full chunk of clay, by the volume of one sphere: The result of 14.9 means that there is enough clay in the chunk to make 14 clay spheres because there is not enough clay to make 15 complete spheres. Student response includes of the above elements. PARCC PBA Paper Assessment: Geometry Mathematics Practice Test - Answer and Alignment Document 9

10 #14 Part A Student response includes each of the following elements: Determination that BE = 16 and DE = 16 Correct algebraic reasoning Recognition of an extraneous solution Because the figure is a parallelogram, the diagonals bisect each other. x 48 x x x 48 0 ( x 8)( x 6) 0 x 8 or x 6 x 6 is not possible because x would equal -1 and length is not negative. So x = 8, BE = 8 48 = 16, and DE = (8) = 16. Notes: If the student makes an error in writing the equation and gets two answers that work, the student must show both solutions to earn the second point. If the student makes a computation error and finds that the diagonals are not congruent, the third reasoning point can be earned if the student concludes that the figure is not a rectangle. Student response includes of the above elements. #14 Part B Student response includes the following element: 1 Explanation of why the parallelogram is a rectangle or that diagonals are congruent. ABCD is a rectangle. Because the lengths AE, BE, CE, and DE are all equal to 16, the diagonals are congruent and parallelogram ABCD is a rectangle. PARCC PBA Paper Assessment: Geometry Mathematics Practice Test - Answer and Alignment Document 10

11 #15 Part A Student response includes the following element.: Correct coordinates of point Q in terms of a, b, and c. 1 (a + b, c) or equivalent Note: Students are not required to show work, but will not be penalized for showing work. #15 Part B Student response includes each of the following elements: Student states that the midpoint of SQ must be the same as the midpoint of PR Provides evidence using appropriate mathematical strategies, reasoning, and/or approaches that verifies SQ and PR bisect each other SQ bisects PR and PR bisects SQ. I know this because the midpoint of SQ has the same coordinates as the midpoint of PR, as shown. 0 a b 0 c a b c midpoint of SQ,, ( a b, c). a b 0 c a b c midpo int of PR,, ( a b, c). Since the point of intersection of SQ and PR is the midpoint of both segments, SQ and PR bisect each other. PARCC PBA Paper Assessment: Geometry Mathematics Practice Test - Answer and Alignment Document 11

12 #16 Student has complete valid proof with valid chains of reasoning. Student Sample Response: Given: Prove: AB is the image of AB after a dilation centered at point C and with scale factor k, k 0. A B = k AB. 1. AB is the image of AB after a dilation centered at point C and with scale factor k, k 0. [given]. CA = k CA; CB = k CB [definition of dilation] CA CB CA CB CA CB 4. CA CB 5. C C. k; k [Division Property of Equality] [Transitive Property of Equality] [Reflexive Property of Congruence] 6. ACB A CB [SAS Triangle Similarity] AB CA CB AB CA CB AB k AB [definition of similar polygons] [Substitution Property of Equality] 9. A B = k AB [Multiplication Property of Equality] Student response contains a valid chain of reasoning but may omit some information. The student must include the SAS Triangle Similarity property correctly. 1 Student response includes valid justified steps, but is an incomplete proof. PARCC PBA Paper Assessment: Geometry Mathematics Practice Test - Answer and Alignment Document 1

13 #17 Student response includes each of the following elements: Valid values for h1 and h Valid approach for determining h1 and h Verification that the design will store at least dump-truck loads of fertilizer Assuming the dump trucks are rectangular prisms, each dump truck stores 88 cubic feet of fertilizer ( ). Two dump trucks will store 576 cubic feet of fertilizer. The volume of the storage building needs to be at least 576 cubic feet. The volume of the storage building equals the volume of the cylinder plus the volume of the cone. I used the maximum diameter of 8 feet. r h 1 1 r h 1 h1 h 4 4 I used the maximum total height of 14 feet. Since the volume of a cone involves dividing by, I made the height of the cone much smaller than the height of the cylinder. h 1 1 h Using h1 11 feet and h feet, the storage building will have a volume greater than 576 cubic feet. Note: Any two heights that have a sum of 14 and create a volume greater than 576 are acceptable. Student response includes of the above elements. PARCC PBA Paper Assessment: Geometry Mathematics Practice Test - Answer and Alignment Document 1

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