8.2 Reflections: Homework

Practice problems 19 and 20 by Brianna Gantt (Period 3)

In Pearson Success Net section 8.2 Reflections, from the Math I book, the practice problems 19 and 20 give the following challenge. "The work of artist and scientist Leonardo da Vinci (1452-1519) has an unusual characteristic. His handwriting is a mirror image of normal handwriting."

#19

a. On paper, write the sentence, "Leonardo da Vinci was left-handed."

b. Write the mirror image of the sentence, "Leonardo da Vinci was left-handed."

c. Use Photo Booth to take a picture of both sentences to see if your mirror image sentence is correct.

d. What would Leonardo ask you to practice while writing sentences in a reflection?

e. Explain why the fact about da Vinci in part (a) might have made mirror writing seem natural to him.

d. I think Leonardo da Vinci would ask me to practice not being as hesitant when I write since I do not typically write sentences in a reflection.

e. I think writing sentences in a reflection was natural and more efficient to da Vinci because he was left-handed. If he wrote sentences left-to-right like right handed writers are natural to do, the ink would smear across the paper. So instead, da Vinci writes from right to left.

#20

Give three examples from every day life of objects or situations that show or use reflections. Take pictures of three objects, graphs or situations in class that show or use reflections.

This graph from 8.2 Homework shows an example of a reflection. Angle JAG (pre-image) is reflected over the y-axis. Angle JAG prime represent the post-image.

This image gives an example of a reflection of my closet door shown from a mirror. The mirror also shows a reflection of my shadow.

This image shows perfect symmetry of a butterfly's wings. The wings are reflected vertically. source: http://www.wisegeek.org/what-is-the-butterfly-effect.htm

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