Q2, W6: November 18-22 Geometry

Teacher Kristin Andreason Geometry Honors 8 November 18-22 Unit 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

Monday/Tuesday:

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

Wednesday:

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

Thursday/Friday:

• 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.