<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> <title>4.C: Dilations</title> <meta name="identifier" content="i631093d75b1181561c9928cb0547275d"/> <meta name="editing_roles" content="teachers"/> <meta name="workflow_state" content="active"/> </head> <body> <div id="HS21"> <div class="overview"> <h2>Overview</h2> <p>The purpose of this lesson is to learn how to perform dilations on figures.</p> <p>This lesson will address the following CCRS Standard(s) for Geometry:</p> <ul> <li><em>8.G.4: Understand that a two-dimensional figure is similar to another if the second can be obtained from the first by a sequence of rotations, reflections, translations, and dilations; given two similar two-dimensional figures, describe a sequence that exhibits the similarity between them</em></li> </ul> </div> <div class="directions"> <h2>Directions</h2> <ol> <li>Take notes while watching videos below</li> <li>Go to <a class="external" href="http://wamap.org/" target="_blank">http://wamap.org</a> and log into our course to complete assignment 4.C with 80% or better.</li> </ol> </div> <h3>Watch</h3> <p><a class="" href="https://youtu.be/9eY5CxThBZo">Dilations [7:32]</a></p> <h3>Do</h3> <p>Complete assignment 4.C with 80% or better at <a href="http://wamap.org">http://wamap.org</a></p> <div class="summary"> <h2>Summary</h2> <p>In this lesson we have learned:</p> <ul> <li>A dilation will create a similar figure whose sides are proportional to the original shape.</li> <li>The point (a,b) when dilated with a scale factor of r centered at the origin will create the new point (ar,br)</li> <li>Scale factors greater than 1 enlarge the image.</li> <li>Scale factors less than 1 (greater than zero) shrink the image.</li> </ul> </div> </div> </body> </html>