1. Module 3

1.11. Lesson 3

Mathematics 10-3 Module 3 Lesson 3

Module 3: Linear Measure

 

Lesson 3: Midpoints

 

Focus

 

This is a photograph of a drill boring a hole in wood. A tape measure is extended next to the wood.

© mashe/shutterstock

Jeff has designed a playhouse for his younger brother and sister. Jeff intends to bolt the frame of the playhouse together. But, he has run into a problem. Jeff needs to drill a hole into a ceiling beam to attach a chandelier. If the hole is not centred, the chandelier will be off-centre.

 

How will Jeff find the centre of the beam in which he will drill the hole? Jeff has a tape measure in imperial units, and he is not sure how to handle fractions. Can you help him? How can you be sure you have located the centre of the beam?

 

Lesson Questions

 

In this lesson you will explore this question:

  • How can you determine the midpoint of a linear measurement such as length, width, height, depth, diagonal, or diameter of a three-dimensional object?
Assessment

 

You will complete the Lesson 3 Assignment Booklet for assessment. Download the Lesson 3 Assignment Booklet and save the file in your course folder now. You will receive further instructions on how to complete the Assignment Booklet later in this lesson.

 

Remember to save all activities, including those that are not part of the Assignment, in your course folder.

 

Required Materials and Equipment

 

You will need the following supplies:

  • a ruler or tape measure showing both imperial and SI units
  • a compass for drawing circles
  • blank sheets of paper
  • a square from a geometry set
  • a calculator