1. Lesson 4

Mathematics 20-3 Module 6

Module 6: Surface Area

 

Lesson 4: Changing Surface Area by Changing Linear Dimensions

 

Focus

 

This is a collection of three photos, with each photo displaying a child and an adult wearing a matching outfit.

iStockphoto/Thinkstock

Wearing matching family outfits may not appeal to you now, but as a kid it might have been kind of fun. When seamstresses or clothiers make similar pieces of clothing in smaller sizes, they require new height and width measurements. If a kid’s knitted hat has half the diameter of the matching hat for the father, would the kid’s version use half the material? Would it be half the cost to buy too?

 

both: iStockphoto/Thinkstock


In this lesson you will explore how the surface area of an object changes when you introduce changes to its linear dimensions. A linear dimension is a measure of distance indicating an object’s width, length, height, or diameter.

 

Lesson Question
  • What is the effect on an object’s surface area when its linear dimensions are altered?
Assessment

 

Your assessment for this lesson may include a combination of the following:

  • course folder submissions from the Try This and Share sections of the lesson

  • your contribution to the Mathematics 20-3: Glossary Terms and the Formula Sheet

  • Lesson 4 Assignment (Save a copy of your lesson assignment to your course folder now.)

  • the Project Connection
Materials and Equipment
  • calculator