#### Document Type

Lesson Plan

#### Publication Date

8-2006

#### Abstract

Goals:

To review locating points in a coordinate system

To predict how figures on a coordinate system are affected by a given rule

To learn that corresponding angles of similar figures are equal and that corresponding sides grow by the same factor

To compare lengths and angles in similar and non-similar figures informally

To experiment with examples and counterexamples of similar shapes

To understand that any two similar figures are related by a scale factor, which is the ratio of the corresponding sides

To understand that the sides and perimeters of similar figures grow by a scale factor and that the areas grow by the square of the scale factor

To recognize that triangles with equal corresponding angles are similar

To use the definition of similarity to recognize when figures are similar

To determine the scale factor between two similar figures

#### Recommended Citation

Simpson, Samuel, "Creating and Understanding Similar Figures using Geometer's Sketch Pad" (2006). *Lesson Plans*. 301.

http://digitalcommons.brockport.edu/cmst_lessonplans/301

*Contains lesson plan and any application files*

#### Tools used

Geometer’s Sketch pad

#### Grade Level

9-12

## Comments

Questions, comments or suggestions about this model may be sent to:

Dr. Leigh Little, The College at Brockport