1. Module 3

1.10. Page 5

Mathematics 10-3 Module 3 Lesson 2

Module 3: Linear Measure

 

Lesson 2 Summary

 

This photograph shows an igloo in a snowy landscape.

© Tyler Olson/shutterstock

Many people associate the igloo with the Inuit of Canada’s Eastern Arctic. The igloo is an example of the ingenuity of a people building a shelter from limited materials at hand. The first layer of snow blocks is laid in a circle. Successive blocks cut from the inside of the igloo spiral upward and inward to form the classic domed shape.

 

The shape of the igloo makes the room both remarkably roomy and comfortable. The igloo illustrates the relationship between the circumference of the base and the diameter of the circular shelter.

 

In this lesson you explored these questions:

  • How can you estimate the circumference of a circle?
  • What is the formula for circumference?
  • How can you apply the formula for circumference to practical situations?

Check your level of understanding of the materials covered in this lesson by completing “Lesson 2 Traffic Lights.” If you select an amber or red traffic light in the multimedia piece, you will receive information about additional work you can complete to improve your understanding of the topics. Complete the suggested work before you proceed to the Lesson 2 Assignment. If you experience difficulty, contact your teacher before starting the Lesson 2 Assignment.

 

You discovered that the circumference of a circle is approximately three times the diameter. Also, you discovered that the ratio was the same for all circles and that this ratio is represented by the symbol . From this ratio, you developed formulas for circumference. You applied these formulas to calculate the circumference of a circle when given either the diameter or radius. As well, given the circumference of a circle, you used these formulas to find the diameter and/or radius.

 

m10_3_assign.jpg Assignment

 

Retrieve the Lesson 2 Assignment Booklet you saved in your course folder at the start of this lesson. Complete the Assignment. Resave your Assignment Booklet in your course folder and submit a copy to your teacher for assessment.

 

Unit 2 Project

 

Before you move on to Lesson 3, you should start thinking about how you can apply the skills you mastered in Lesson 2 to the Unit 2 Project.