Define geometric terms precisely

Start lessonBegins with Undefined terms and basic definitions · Slides

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Lesson Plan · Guided Notes · Exit Ticket · Re-teach · Homework

Lesson Plan →Objectives, pacing and practice, built from this lesson's brief.
Guided Notes →One page your students fill in and keep.
Exit Ticket →Three items at the end of class. No student accounts.
Re-teach →After an exit ticket: who missed what, and what to do tomorrow.
Homework →Assign practice; it grades itself.

HSG.CO.A.1

**HSG.CO.A.1**: Know precise definitions of angle, circle, perpendicular line, parallel line, and line segment, based on the undefined notions of point, line, distance along a line, and distance around a circular arc.

HSG.CO.A.1: Know precise definitions of angle, circle, perpendicular line, parallel line, and line segment, based on the undefined notions of point, line, distance along a line, and distance around a circular arc.

What you'll learn

State precise definitions for angle, circle, perpendicular line, parallel line, and line segment
Explain how these definitions build on the undefined notions of point, line, distance along a line, and distance around a circular arc
Distinguish between defined terms (those built from undefined concepts) and undefined terms (accepted without definition)
Use precise definitions to identify whether given examples satisfy the definition of each term
Recognize the importance of precision in mathematical definitions and how it differs from informal everyday language

Slides

Step through the lesson, or watch it as a narrated video • 2 slide decks

Undefined terms and basic definitions

✓ Start here

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Parallel perpendicular and proof precision

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Practice

Try it on your own

Exercise

Practice problems, checked as you go

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