Answer Key — HSF.TF.A.2

For parents and tutors

Do not share with students before practice tests.

Practice Problems — Sets 1–10

| Set | Guidance | | --- | --- | | Set 1 | Explain how the unit circle in the coordinate plane enables the exten… — verify written work and accept reasonable drawings. | | Set 2 | Explain how the unit circle in the coordinate plane enables the exten… — verify written work and accept reasonable drawings. | | Set 3 | Explain how the unit circle in the coordinate plane enables the exten… — verify written work and accept reasonable drawings. | | Set 4 | Explain how the unit circle in the coordinate plane enables the exten… — verify written work and accept reasonable drawings. | | Set 5 | Explain how the unit circle in the coordinate plane enables the exten… — verify written work and accept reasonable drawings. | | Set 6 | Explain how the unit circle in the coordinate plane enables the exten… — verify written work and accept reasonable drawings. | | Set 7 | Explain how the unit circle in the coordinate plane enables the exten… — verify written work and accept reasonable drawings. | | Set 8 | Explain how the unit circle in the coordinate plane enables the exten… — verify written work and accept reasonable drawings. | | Set 9 | Explain how the unit circle in the coordinate plane enables the exten… — verify written work and accept reasonable drawings. | | Set 10 | Explain how the unit circle in the coordinate plane enables the exten… — verify written work and accept reasonable drawings. |

Practice Problems — Sets 11–20

| Set | Guidance | | --- | --- | | Set 11 | Explain how the unit circle in the coordinate plane enables the exten… — verify written work and accept reasonable drawings. | | Set 12 | Explain how the unit circle in the coordinate plane enables the exten… — verify written work and accept reasonable drawings. | | Set 13 | Explain how the unit circle in the coordinate plane enables the exten… — verify written work and accept reasonable drawings. | | Set 14 | Explain how the unit circle in the coordinate plane enables the exten… — verify written work and accept reasonable drawings. | | Set 15 | Explain how the unit circle in the coordinate plane enables the exten… — verify written work and accept reasonable drawings. | | Set 16 | Explain how the unit circle in the coordinate plane enables the exten… — verify written work and accept reasonable drawings. | | Set 17 | Explain how the unit circle in the coordinate plane enables the exten… — verify written work and accept reasonable drawings. | | Set 18 | Explain how the unit circle in the coordinate plane enables the exten… — verify written work and accept reasonable drawings. | | Set 19 | Explain how the unit circle in the coordinate plane enables the exten… — verify written work and accept reasonable drawings. | | Set 20 | Explain how the unit circle in the coordinate plane enables the exten… — verify written work and accept reasonable drawings. |

Review tiers 1–10

Checklists are parent-judged.
Written items: verify against practice set patterns.
Standard text: Explain how the unit circle in the coordinate plane enables the extension of trigonometric functions to all real numbers, interpreted as radian measures of angles traversed counterclockwise around the unit circle.

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 |

___________________________ ___________________________ ___________________________ ___________________________ ___________________________ ___________________________