Lesson 3


LESSON 3.  Defining Symmetry


Objective:  Students learn to recognize symmetry.




View Thru Geometric Solids
Getting into Solids (Prisms) (optional)

Getting into Solids (Pyramids) optional


Teacher Notes:

Symmetry is difficult to teach.  Symmetry to a scientist, engineer, artist, or mathematician will depend on their different perspectives.  This lesson is just meant to be an introduction and for students to observe and try to classify symmetry.  In a later lesson we will go into the crystal structure in more detail so they can classify the crystal structure of the periodic table. 


There are many web sites with animations of different forms.  They might help you explain symmetry to your students.  If you purchase a set, you might want to use them for the questions on overall symmetry and rotational symmetry.         




1. a.  bilateral, reflective; b. 4 fold; bilateral; c. cubic, 8 fold; d.  radial, infinite; e.  bilateral, reflective; f.  hexagonal, reflective g.  pentagon, 5 fold; h. bilateral, reflective

2.  it is not reflective, house should be upside down and inverted

3.  a,b bilateral, cubic; c,d.  bilateral, 4 fold; e. pentagonal, 5 fold; f.g  bilateral, 3 fold; h. cubic, 8 fold; i bilateral, 3 fold; j,k, l, n bilateral, infinite; m  radial, infiinite   



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