11.3 (Part 2) Symmetries

 

Line Symmetry

 

→ a figure has line symmetry when it is its own image under a reflection in line l.

 

 

Figure

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

How many lines of symmetry does each one have?

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Turn Symmetry (aka Rotational Symmetry)

 

→ a figure has turn symmetry when the traced figure can be rotated less than 360 about some point so that it matches the original figure.

 

 

Figure

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Figure

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Point Symmetry

 

→ a figure that has 180 turn symmetry also has point symmetry.

 

 

 

 

 

 

Figure