Q2, W6: November 18-22 Geometry

TeacherKristin Andreason
Subject AreaGeometry Honors
Grade Level8
Week #November 18-22
Unit of InstructionUnit 3: Similarity
Standard(s) Taught

MAFS.912.G-SRT.1.1: 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.

Learning Targets and Learning Criteria
  • use dilations to prove similar figures.
  • define dilation (clarify that dilations are not rigid motions).
  • use real-world applications of dilations.
  • perform a dilation with a given center and scale factor on a figure in the coordinate plane.
  • verify that when a side passes through the center of dilation, the side and its image lie on the same line.
  • verify that corresponding sides of the pre-image and images are parallel.
  •  verify that a side length of the image is equal to the scale factor multiplied by the corresponding side length of the pre-image.
Classroom Activities


  • 5th/8th period will take DIA
  • 3rd period will review for DIA


  • I will introduce Dilations
  • Students will take notes in their ISN on page 26


  • 3rd period will take the DIA
  • 5th and 8th period will do a scale drawing, which is a type of dilation
Assignments Due
  • DIA should be taken by November 22.
Additional Resources

All IEP and ESOL accommodations are provided daily.