💬 Parallel Lines & Transversals: Mixed Practice & Reasoning (G-CO.C.9)

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Prove and apply theorems about lines and angles. Read each problem. Draw or write to solve. Label your answer.

1. Parallel lines cut by a transversal. Corresponding angle to 99° = ___

Work

Answer: ______________

2. Same-side interior angle to 117° = ___

Work

Answer: ______________

3. Alternate interior angles: (3x)° and 60°. x = ___

Work

Answer: ______________

4. Parallel lines cut by a transversal. Corresponding angle to 51° = ___

Work

Answer: ______________

5. Same-side interior angle to 44° = ___

Work

Answer: ______________

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

Work

Answer: ______________

Answer key: 1) 99° · 2) 63° · 3) 20 · 4) 51° · 5) 136° · 6) 20

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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 — mixed practice with space to reason and check, 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: Show Your Thinking (G-CO.C.9) · Parallel Lines & Transversals: Quick Check (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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