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Basic Geometry Definitions

Core Standard: HSG-CO.A.1

Aligned To Common Core Standard:

High School Congruence- HSG-CO.A.1

Printable Worksheets And Lessons


  • A Circle And Lines Step-by-step Lesson-A circle encases parallel and perpendicular lines. Wow, what possibilities!

  • Guided Lesson - Naming angles, intersecting lines, right angles, and the difference between parallel and perpendicular.

  • Guided Lesson Explanation - This is explained in a more round about away than other sections are worded.

  • Practice Worksheet - I was able to parlay ten questions from two geometric drawings. We focus on the same skills you will find in the standards.

  • Matching Worksheet - Note to self, I forget to add the distance along lines and circles that the standard asks for. Include that in five packs.

AnswersAnswer Keys



View Answer Keys- All the answer keys in one file.





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Homework Sheets

It's all about calling out lines. Perpendicular versus parallel lines, intersecting lines and naming angles.




Practice Worksheets

We give you a basic geometric layout and ask you to apply your geometry vocabulary.




Math Skill Quizzes

These focus a bit more on naming angles than naming lines.