1. Lesson 8

1.10. Lesson 8 Summary

Mathematics 20-2 M2 Lesson 8

Module 2: Logic and Geometry

 
Lesson 8 Summary
 

This is a photo of two Ukrainian dancers in front of a giant Easter egg, a roadside attraction, at Vegreville.

Alberta Economic Development

 

Ukrainian dancers perform in front of the world’s largest Ukrainian Easter egg at Vegreville. This roadside attraction, also called the Pysanka, was built in 1975 to commemorate the community’s Ukrainian heritage.

 

Parallel lines are used in a variety of situations. They are found in geometric designs on clothing and pottery. Parallel lines can be found in artifacts or scratched into the ground or rock at ancient sites.

 

An understanding of the properties of angles formed by parallel lines and a transversal is very useful when creating or examining geometric designs. For example, these angle properties can be used to help develop a strategy for constructing parallel lines with a protractor or a compass.

 

The angle properties can also be used to prove lines are parallel or to determine the measures of unknown angles. If lines are not parallel, an understanding of the angle properties allows you to identify errors and determine why the lines are not parallel. This information can then be used to develop a strategy for making the lines parallel.

 

You will use the properties of angles formed when a transversal intersects parallel lines to solve problems involving triangles in Lesson 9.