Teacher resources and professional development across the curriculum

Teacher professional development and classroom resources across the curriculum

Monthly Update sign up
Mailing List signup
Follow The Annenberg Learner on LinkedIn Follow The Annenberg Learner on Facebook Follow Annenberg Learner on Twitter
Learning Math Home
Geometry Session 8: Notes
Session 8 Part A Part B Part C Homework
Algebra Site Map
Session 8 Materials:



Notes for Session 8, Part A

Note 2

In the cat's-head problem, you are doing a transformation that's called dilation. You've seen transformations before -- such as translation, rotation, and reflection. These "rigid transformations" preserve congruence; when you apply one to a figure, it may move around, but it maintains its size and shape.

Dilation (scaling) can change not just the position of the figure, but also its size. There's another non-rigid transformation called a shear that can even change the overall shape of a figure -- the final product, for example, may have different angle measurements than the original.

<< back to Part A: Scale Drawings


Learning Math Home | Geometry Home | Glossary | Map | ©

Session 8 | Notes | Solutions | Video

© Annenberg Foundation 2015. All rights reserved. Legal Policy