Teacher resources and professional development across the curriculum

Teacher professional development and classroom resources across the curriculum

Monthly Update sign up
Mailing List signup
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 2016. All rights reserved. Legal Policy