Geometric Logic and Spatial Reasoning · Term 2

Introduction to Circles: Parts and Terminology

Students will identify and define key parts of a circle, including radius, diameter, chord, tangent, and secant.

Key Questions

  1. Differentiate between a chord and a diameter of a circle.
  2. Explain the unique relationship between a tangent line and the radius at the point of tangency.
  3. Analyze how the length of a chord relates to its distance from the center of the circle.

Ontario Curriculum Expectations

CCSS.MATH.CONTENT.7.G.B.4CCSS.MATH.CONTENT.HSG.C.A.2
Grade: Grade 9
Subject: Mathematics
Unit: Geometric Logic and Spatial Reasoning
Period: Term 2

Suggested Methodologies

Concept Mapping

Build visual maps of concept relationships

20–40 min

Learn more about Concept Mapping

Think-Pair-Share

Individual reflection, then partner discussion, then class share-out

10–20 min

Learn more about Think-Pair-Share

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More in Geometric Logic and Spatial Reasoning

Introduction to Transformations

Students will define and identify translations, reflections, and rotations as rigid transformations.

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Translations on the Coordinate Plane

Students will perform and describe translations of figures using coordinate rules.

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Reflections on the Coordinate Plane

Students will perform and describe reflections of figures across the x-axis, y-axis, and other lines.

2 methodologies

Rotations on the Coordinate Plane

Students will perform and describe rotations of figures about the origin (90°, 180°, 270°).

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Dilations and Scale Factor

Students will perform and describe dilations of figures, understanding the role of the scale factor and center of dilation.

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