1. Lesson 4

1.8. Explore 4

Mathematics 30-3 Module 5

Module 5: Geometry

 

In Try This 2, you may have noticed that reflecting a diagram produces a symmetrical picture where the line of symmetry is the same as the line of reflection. Two common lines of reflection are the x-axis and the y-axis.

 

 
This diagram shows a polygon reflected across the x-axis.
This diagram shows a polygon reflected across the y-axis.

 

 


 

When reflecting in the x-axis, you change the sign of the y-coordinate of each point.

 

 

This diagram shows a polygon reflected across the x-axis.

 

When reflecting in the y-axis, you change the sign of the x-coordinate of each point.

 

 

This diagram shows a polygon reflected across the y-axis.

 

Self-Check 2


textbook
  1. Answer “Mental Math and Estimation” questions a. through e. from page 221 of the textbook. Answer
  2. Answer “Build Your Skills” questions 1 and 3 from pages 226 and 227 of the textbook. Answer
Visualize the shape and imagine it being folded in half to create mirror images.