✅ Parallel Lines & Transversals: Quick Check (G-CO.C.9)

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Prove and apply theorems about lines and angles. Work on your own. Then check your answers.

1. Parallel lines cut by a transversal. Corresponding angle to 88° = ___

2. Same-side interior angle to 90° = ___

3. Alternate interior angles: (3x + 3)° and 63°. x = ___

4. Parallel lines cut by a transversal. Corresponding angle to 142° = ___

5. Same-side interior angle to 84° = ___

6. Alternate interior angles: (3x + 19)° and 79°. x = ___

7. Parallel lines cut by a transversal. Corresponding angle to 86° = ___

8. Same-side interior angle to 99° = ___

9. Alternate interior angles: (3x + 4)° and 64°. x = ___

10. Parallel lines cut by a transversal. Corresponding angle to 58° = ___

Score: ____ / 10 I can prove and apply theorems about lines and angles: ☐ yes ☐ almost ☐ not yet

Answer key: 1) 88° · 2) 90° · 3) 20 · 4) 142° · 5) 96° · 6) 20 · 7) 86° · 8) 81° · 9) 20 · 10) 58°

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Worksheets › Grade 10 Math (Geometry) › Parallel Lines & Transversals › Parallel Lines & Transversals

Grade 10 (ages 15–16)Numbers & mathsFree printable PDF

About this grade 10 worksheet

Free Grade 10 Geometry math worksheet (Common Core G-CO.C.9): parallel lines & transversals — a ten-question quick check (quiz), with answer key. Skill: Prove and apply theorems about lines and angles. Level: Grade 10 — also suits Year 11 (UK).

For teachers: skills & standards

CCSS G-CO.C.9: Prove and apply theorems about lines and angles
Works as a morning-work page, a centre/station activity, homework or an early-finisher task.

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What age is it for?

It is designed for Grade 10 (ages 15–16), but use it with any child who is ready.

What skills does it build?

Prove and apply theorems about lines and angles.

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More “Parallel Lines & Transversals” printables (g-co.c.9: prove and apply theorems about lines and angles)

Parallel Lines & Transversals: Practice A (G-CO.C.9) · Parallel Lines & Transversals: Practice B (G-CO.C.9) · Parallel Lines & Transversals: Mixed Practice & Reasoning (G-CO.C.9) · Parallel Lines & Transversals: Show Your Thinking (G-CO.C.9)

All 5 parallel lines & transversals sheets → · Grade 10 Math (Geometry): all 10 skills → · All Common Core grades

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