Free Printable WorksheetMathGeometryMath CurriculumG-CO.B.6-8

GEO.79 Complete congruent triangle proofs Worksheet

Download our free printable Geometry Math worksheet on GEO.79 Complete congruent triangle proofs. Ideal for classroom practice, homeschool learning, independent homework, and standardized test preparation. Available in both print-ready PDF and editable DOCX formats.

Choose your preferred download format:

100% Free • No registration or login required • Instant file access

Download PDF
Prefer interactive practice with instant grading and explanations?Practice Complete congruent-triangle proofs Online

Worksheet Overview & Skills Covered

Core academic competencies and curriculum alignment

This Geometry Math worksheet provides structured practice on GEO.79 Complete congruent triangle proofs. Students are guided through targeted exercises that build foundational understanding, computational accuracy, and critical thinking skills.

GEO.79 Complete congruent-triangle proofs - Primary standard selected for prompt fields in this prompt cell: CCSS G-CO.B.6-8. Skill statement in this prompt cell: Select the missing statement or reason that correctly completes a congruent-triangle proof. Associated standards listed with this skill in the curriculum source: CCSS G-CO.B.6-8; NY GEO G.G-CO.B; FL MA.912.GR.2.6; TEKS §111.41(c). Use this prompt-provided wording as the supporting standard description for this workflow.

Whether you are an educator preparing classroom handouts, a tutor reinforcing weekly topics, or a parent supporting homeschool learning, this printable resource gives students the deliberate practice required to achieve subject fluency and master state standards.

Grade

Geometry

Subject

Math

Domain

Math Curriculum

Formats

PDF & DOCX

Sample Practice Problems

Preview the types of problems and questions covered in this worksheet

Below are sample questions representative of the exercises included on this worksheet and related GEO.79 Complete congruent triangle proofs skill assessments:

Problem 1Difficulty: Mastery
In a flow proof, AB is parallel to DE and BC is parallel to EF. The proof uses angle ABC congruent to angle DEF and angle BCA congruent to angle EFD, plus BC congruent to EF. Which missing reason proves triangle ABC congruent to triangle DEF?
ASAS Congruence Theorem
BAAS Congruence Theorem
CSSS Congruence Theorem
DASA Congruence Theorem
Solution & Explanation:Side BC lies between the two known angles B and C, and EF lies between the corresponding angles E and F. The correct theorem is ASA.
Problem 2Difficulty: Mastery
A proof compares triangle LMN and triangle PQR. It has LM congruent to PQ and MN congruent to QR. To complete the proof by SAS, which missing angle statement must be used?
Aangle LNM is congruent to angle PRQ
Bangle MLN is congruent to angle QPR
Cangle LMN is congruent to angle PQR
Dangle L is congruent to angle R
Solution & Explanation:The included angle between LM and MN is angle LMN. The included angle between PQ and QR is angle PQR, so those angles must be congruent for SAS.
Problem 3Difficulty: Mastery
Triangle ABC and triangle DEF have angle A congruent to angle D, angle B congruent to angle E, and side AB congruent to DE. Which missing reason completes the proof most precisely?
AAAS Congruence Theorem
BASA Congruence Theorem
CSAS Congruence Theorem
DHL Congruence Theorem
Solution & Explanation:Side AB is included between angles A and B, and side DE is included between angles D and E. Therefore ASA is the precise reason.

Want more practice questions with step-by-step guidance?

Practice All Questions Online

Frequently Asked Questions

Common questions about printing, using, and solving this worksheet

QHow do I download and print this GEO.79 Complete congruent triangle proofs worksheet?

Click either the "Download PDF" or "Download DOCX" button at the top of the page. You can print the PDF directly from your browser or edit the DOCX file in Microsoft Word or Google Docs to tailor the questions to your students.

QIs this GEO.79 Complete congruent triangle proofs worksheet free for teachers and homeschoolers?

Yes! All learning materials, worksheets, and practice resources on Free K12 Practice are 100% free for teachers, students, parents, tutors, and homeschooling families for non-commercial educational use. No account or subscription is required.

QCan students practice GEO.79 Complete congruent triangle proofs online with instant feedback?

Yes! In addition to this printable worksheet, students can practice GEO.79 Complete congruent triangle proofs interactively on our platform with automated grading, instant score tracking, and detailed step-by-step solutions.

QWhat grade level and standards does this worksheet align with?

This worksheet is designed specifically for Geometry Math students. It aligns with educational standard G-CO.B.6-8 (Primary standard selected for prompt fields in this prompt cell: CCSS G-CO.B.6-8. Skill statement in this prompt cell: Select the missing statement or reason that correctly completes a congruent-triangle proof. Associated standards listed with this skill in the curriculum source: CCSS G-CO.B.6-8; NY GEO G.G-CO.B; FL MA.912.GR.2.6; TEKS §111.41(c). Use this prompt-provided wording as the supporting standard description for this workflow.).

Related Geometry Math Resources

Continue learning with complementary skill worksheets and online practice

More Geometry Worksheets

GEO.1 Make sense of problems and persevere
GEO.10 Choose an efficient problem solving representation
GEO.100 Law of Cosines
GEO.101 Area of a triangle using trigonometry and other methods
Browse all Geometry Worksheets

Interactive Online Skills

GEO.1Make sense of problems and persevere
GEO.2Reason abstractly and quantitatively
GEO.3Construct viable arguments and critique reasoning
GEO.4Model with mathematics
Browse all Geometry Interactive Practice