Answer Key — HSG.CO.A.2

For parents and tutors

Do not share with students before practice tests.

Practice Problems — Sets 1–10

| Set | Guidance | | --- | --- | | Set 1 | Represent transformations in the plane using, e — verify written work and accept reasonable drawings. | | Set 2 | Represent transformations in the plane using, e — verify written work and accept reasonable drawings. | | Set 3 | Represent transformations in the plane using, e — verify written work and accept reasonable drawings. | | Set 4 | Represent transformations in the plane using, e — verify written work and accept reasonable drawings. | | Set 5 | Represent transformations in the plane using, e — verify written work and accept reasonable drawings. | | Set 6 | Represent transformations in the plane using, e — verify written work and accept reasonable drawings. | | Set 7 | Represent transformations in the plane using, e — verify written work and accept reasonable drawings. | | Set 8 | Represent transformations in the plane using, e — verify written work and accept reasonable drawings. | | Set 9 | Represent transformations in the plane using, e — verify written work and accept reasonable drawings. | | Set 10 | Represent transformations in the plane using, e — verify written work and accept reasonable drawings. |

Practice Problems — Sets 11–20

| Set | Guidance | | --- | --- | | Set 11 | Represent transformations in the plane using, e — verify written work and accept reasonable drawings. | | Set 12 | Represent transformations in the plane using, e — verify written work and accept reasonable drawings. | | Set 13 | Represent transformations in the plane using, e — verify written work and accept reasonable drawings. | | Set 14 | Represent transformations in the plane using, e — verify written work and accept reasonable drawings. | | Set 15 | Represent transformations in the plane using, e — verify written work and accept reasonable drawings. | | Set 16 | Represent transformations in the plane using, e — verify written work and accept reasonable drawings. | | Set 17 | Represent transformations in the plane using, e — verify written work and accept reasonable drawings. | | Set 18 | Represent transformations in the plane using, e — verify written work and accept reasonable drawings. | | Set 19 | Represent transformations in the plane using, e — verify written work and accept reasonable drawings. | | Set 20 | Represent transformations in the plane using, e — verify written work and accept reasonable drawings. |

Review tiers 1–10

• Checklists are parent-judged.
• Written items: verify against practice set patterns.
• Standard text: 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).

Practice test scoring

| Tier | Pass guidance | | --- | --- | | 1–3 | Most oral tasks smooth; majority of written correct | | 4–6 | 7/10+ total with clear understanding | | 7–8 | 9/12+ with explanations | | 9–10 | Near-perfect; ready to move on |

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