Symmetry, Day 1

Today's lesson started with a review of identifying different types of symmetry in images. We looked at 17 different logos and determined if they have line symmetry or rotational symmetry.

For line symmetry, the image needs an imaginary line that presents mirror images. Many figures have vertical line symmetry, but the line can come in at any angle.

For rotational symmetry, the image needs to align with itself when it is spun around by less than 360° (every image has 360° rotational symmetry). To calculate the rotational symmetry, divide 360° by the number of points on the image that it can turn to.

For our graphs, we consider images that have vertical line symmetry at the y-axis to be even. And, images that have 180° rotational symmetry about the origin to be odd.

Homework: Worksheet on Graphs of Even & Odd Functions

Remember, there is a TEST scheduled for Thursday!

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