Learning Goal
Verify dilation properties
Teacher tools for this standard
Lesson Plan · Guided Notes · Exit Ticket · Re-teach · Homework
Teacher tools for this standard
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.SRT.A.1**: Verify experimentally the properties of dilations given by a center and a scale factor:
a. A dilation takes a line not passing through the center of the dilation to a parallel line, and leaves a line passing through the center unchanged.
b. The dilation of a line segment is longer or shorter in the ratio given by the scale factor.
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HSG.SRT.A.1: Verify experimentally the properties of dilations given by a center and a scale factor:
a. A dilation takes a line not passing through the center of the dilation to a parallel line, and leaves a line passing through the center unchanged.
b. The dilation of a line segment is longer or shorter in the ratio given by the scale factor.
What you'll learn
- Define a dilation in terms of a center point and a scale factor
- Verify experimentally that a dilation takes a line not passing through the center to a parallel line
- Verify experimentally that a dilation leaves a line passing through the center unchanged
- Verify experimentally that the dilation of a line segment is longer or shorter in the ratio given by the scale factor
- Perform dilations on geometric figures using graph paper, tracing paper, or geometry software
- Distinguish dilations from rigid motions by recognizing that dilations change size but preserve shape
Slides
Step through the lesson, or watch it as a narrated video
Properties of dilations
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