Geometry Curriculum Unit 12: Circles and Conics

Geometry Unit 12 is a complete high school unit on circles and conics. It covers circle vocabulary, angle relationships, segment lengths, sector area, arc length, tangent lines, and circles in the coordinate plane.

The unit is written for 30 to 45 minute class periods and comes with a 25-day pacing guide.

What’s included

• Unit prep materials: pacing guide, vocabulary lists, pre-assessment, warm-ups, exit tickets, and lesson plan templates
• 9 complete lessons with structured notes and guided practice
• Editable version, so you can adjust the unit for your specific needs. You must have PowerPoint to edit.
• Assessments: quizzes, an end-of-unit study guide, and a unit exam
• Answer keys for all practice pages, activities, and assessments

Lessons in this unit

1. Parts of a Circle
2. Central Angles
3. Inscribed Angles
4. Tangent Lines
5. Chords and Arcs
6. Angle Measures in Circles
7. Segment Lengths
8. Area of Sectors and Arc Lengths
9. Circles in the Coordinate Plane

Activities included

These activities come with the unit:

• Angle Measures of Circles Coloring Page
• Area of Sectors and Arc Lengths Scavenger Hunt
• Central Angles Matching
• Chords and Arcs Circuit
• Circles in the Coordinate Plane Puzzle
• Inscribed Angles Matching Cards
• Parts of a Circle Coloring Page
• Segments in Circles Dominos
• Tangent Lines Maze

Good to know

The notes are detailed and scaffolded, which saves hours of prep. The activities require real thinking, the assessments measure understanding, and the pacing keeps the unit manageable and predictable. The unit was written by an experienced geometry teacher.

Quick facts

• Topic: circles and conics
• Grades: 8–11
• CCSS: HSA-REI.D.10, HSG-CO.A.1, HSG-C.A.2, HSG-C.A.4, HSG-C.B.5, HSG-GPE.A.1, HSG-GPE.B.4, HSG-GPE.B.6
• Answer key: included

Free resources

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Terms of use

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